diff --git a/tests/qemublocktest.c b/tests/qemublocktest.c
index 0bc4b65449..1bf72a4615 100644
--- a/tests/qemublocktest.c
+++ b/tests/qemublocktest.c
@@ -420,8 +420,8 @@ testQemuImageCreate(const void *opaque)
         return -1;
 
     /* fake some sizes */
-    src->capacity = 1337;
-    src->physical = 42;
+    src->capacity = UINT_MAX * 2ULL;
+    src->physical = UINT_MAX + 1ULL;
 
     if (qemuDomainValidateStorageSource(src, data->qemuCaps) < 0)
         return -1;
diff --git a/tests/qemublocktestdata/imagecreate/luks-encopts.json b/tests/qemublocktestdata/imagecreate/luks-encopts.json
index f065ad89a7..c5ca863f5b 100644
--- a/tests/qemublocktestdata/imagecreate/luks-encopts.json
+++ b/tests/qemublocktestdata/imagecreate/luks-encopts.json
@@ -2,7 +2,7 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.img",
-  "size": 42
+  "size": 4294967296
 }
 
 format:
@@ -15,5 +15,5 @@ format:
   "ivgen-hash-alg": "sha256",
   "driver": "luks",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337
+  "size": 8589934590
 }
diff --git a/tests/qemublocktestdata/imagecreate/luks-noopts.json b/tests/qemublocktestdata/imagecreate/luks-noopts.json
index 1ea1948119..8a0944151d 100644
--- a/tests/qemublocktestdata/imagecreate/luks-noopts.json
+++ b/tests/qemublocktestdata/imagecreate/luks-noopts.json
@@ -2,7 +2,7 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.img",
-  "size": 42
+  "size": 4294967296
 }
 
 format:
@@ -10,5 +10,5 @@ format:
   "key-secret": "0123456789ABCDEF0123456789ABCDE-encalias",
   "driver": "luks",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337
+  "size": 8589934590
 }
diff --git a/tests/qemublocktestdata/imagecreate/network-gluster-qcow2.json b/tests/qemublocktestdata/imagecreate/network-gluster-qcow2.json
index aee7bfd401..3e35beb088 100644
--- a/tests/qemublocktestdata/imagecreate/network-gluster-qcow2.json
+++ b/tests/qemublocktestdata/imagecreate/network-gluster-qcow2.json
@@ -17,12 +17,12 @@ protocol:
       }
     ]
   },
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337
+  "size": 8589934590
 }
diff --git a/tests/qemublocktestdata/imagecreate/network-rbd-qcow2.json b/tests/qemublocktestdata/imagecreate/network-rbd-qcow2.json
index 56d9c0f1ed..67e2679dae 100644
--- a/tests/qemublocktestdata/imagecreate/network-rbd-qcow2.json
+++ b/tests/qemublocktestdata/imagecreate/network-rbd-qcow2.json
@@ -15,12 +15,12 @@ protocol:
       }
     ]
   },
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337
+  "size": 8589934590
 }
diff --git a/tests/qemublocktestdata/imagecreate/network-sheepdog-qcow2.json b/tests/qemublocktestdata/imagecreate/network-sheepdog-qcow2.json
index b7272625a2..d86bef6bc8 100644
--- a/tests/qemublocktestdata/imagecreate/network-sheepdog-qcow2.json
+++ b/tests/qemublocktestdata/imagecreate/network-sheepdog-qcow2.json
@@ -9,12 +9,12 @@ protocol:
     },
     "vdi": "asdf/i.qcow2"
   },
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337
+  "size": 8589934590
 }
diff --git a/tests/qemublocktestdata/imagecreate/network-ssh-qcow2.json b/tests/qemublocktestdata/imagecreate/network-ssh-qcow2.json
index 31416ed4fc..d58054c081 100644
--- a/tests/qemublocktestdata/imagecreate/network-ssh-qcow2.json
+++ b/tests/qemublocktestdata/imagecreate/network-ssh-qcow2.json
@@ -8,12 +8,12 @@ protocol:
       "port": "1234"
     }
   },
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337
+  "size": 8589934590
 }
diff --git a/tests/qemublocktestdata/imagecreate/qcow2-backing-luks.json b/tests/qemublocktestdata/imagecreate/qcow2-backing-luks.json
index 63ba35dc79..5f9a800c6c 100644
--- a/tests/qemublocktestdata/imagecreate/qcow2-backing-luks.json
+++ b/tests/qemublocktestdata/imagecreate/qcow2-backing-luks.json
@@ -2,14 +2,14 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.qcow2",
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337,
+  "size": 8589934590,
   "backing-file": "/var/lib/libvirt/images/i.img",
   "backing-fmt": "luks"
 }
diff --git a/tests/qemublocktestdata/imagecreate/qcow2-backing-raw-nbd.json b/tests/qemublocktestdata/imagecreate/qcow2-backing-raw-nbd.json
index b9d1d97302..c10ab98c8a 100644
--- a/tests/qemublocktestdata/imagecreate/qcow2-backing-raw-nbd.json
+++ b/tests/qemublocktestdata/imagecreate/qcow2-backing-raw-nbd.json
@@ -2,14 +2,14 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.qcow2",
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337,
+  "size": 8589934590,
   "backing-file": "nbd://example.com:1234",
   "backing-fmt": "raw"
 }
diff --git a/tests/qemublocktestdata/imagecreate/qcow2-backing-raw.json b/tests/qemublocktestdata/imagecreate/qcow2-backing-raw.json
index 8176c8dadd..eb9fb413f6 100644
--- a/tests/qemublocktestdata/imagecreate/qcow2-backing-raw.json
+++ b/tests/qemublocktestdata/imagecreate/qcow2-backing-raw.json
@@ -2,14 +2,14 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.qcow2",
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337,
+  "size": 8589934590,
   "backing-file": "/var/lib/libvirt/images/i.img",
   "backing-fmt": "raw"
 }
diff --git a/tests/qemublocktestdata/imagecreate/qcow2-luks-encopts-backing.json b/tests/qemublocktestdata/imagecreate/qcow2-luks-encopts-backing.json
index a57617dfac..641b5e04c9 100644
--- a/tests/qemublocktestdata/imagecreate/qcow2-luks-encopts-backing.json
+++ b/tests/qemublocktestdata/imagecreate/qcow2-luks-encopts-backing.json
@@ -2,14 +2,14 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.qcow2",
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337,
+  "size": 8589934590,
   "backing-file": "/var/lib/libvirt/images/i.qcow2",
   "backing-fmt": "qcow2",
   "encrypt": {
diff --git a/tests/qemublocktestdata/imagecreate/qcow2-luks-encopts.json b/tests/qemublocktestdata/imagecreate/qcow2-luks-encopts.json
index 8796726fcb..28c85ec90b 100644
--- a/tests/qemublocktestdata/imagecreate/qcow2-luks-encopts.json
+++ b/tests/qemublocktestdata/imagecreate/qcow2-luks-encopts.json
@@ -2,14 +2,14 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.qcow2",
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337,
+  "size": 8589934590,
   "encrypt": {
     "key-secret": "0123456789ABCDEF0123456789ABCDE-encalias",
     "cipher-alg": "serpent-256",
diff --git a/tests/qemublocktestdata/imagecreate/qcow2-luks-noopts.json b/tests/qemublocktestdata/imagecreate/qcow2-luks-noopts.json
index f9caaee6bb..b5063a846d 100644
--- a/tests/qemublocktestdata/imagecreate/qcow2-luks-noopts.json
+++ b/tests/qemublocktestdata/imagecreate/qcow2-luks-noopts.json
@@ -2,14 +2,14 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.qcow2",
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337,
+  "size": 8589934590,
   "encrypt": {
     "key-secret": "0123456789ABCDEF0123456789ABCDE-encalias",
     "format": "luks"
diff --git a/tests/qemublocktestdata/imagecreate/qcow2.json b/tests/qemublocktestdata/imagecreate/qcow2.json
index 7142cf67b6..732763b763 100644
--- a/tests/qemublocktestdata/imagecreate/qcow2.json
+++ b/tests/qemublocktestdata/imagecreate/qcow2.json
@@ -2,12 +2,12 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.qcow2",
-  "size": 42
+  "size": 4294967296
 }
 
 format:
 {
   "driver": "qcow2",
   "file": "0123456789ABCDEF0123456789ABCDE",
-  "size": 1337
+  "size": 8589934590
 }
diff --git a/tests/qemublocktestdata/imagecreate/raw.json b/tests/qemublocktestdata/imagecreate/raw.json
index 06abb25ab9..89a6c2d237 100644
--- a/tests/qemublocktestdata/imagecreate/raw.json
+++ b/tests/qemublocktestdata/imagecreate/raw.json
@@ -2,7 +2,7 @@ protocol:
 {
   "driver": "file",
   "filename": "/var/lib/libvirt/images/i.img",
-  "size": 42
+  "size": 4294967296
 }
 
 format: