diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 3cafbfb600..a2fcb649b3 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -289,7 +289,7 @@ qemuNetworkIfaceConnect(virDomainDefPtr def,
                         virDomainNetDefPtr net,
                         virQEMUCapsPtr qemuCaps,
                         int *tapfd,
-                        int *tapfdSize)
+                        size_t *tapfdSize)
 {
     const char *brname;
     int ret = -1;
@@ -433,7 +433,7 @@ qemuOpenVhostNet(virDomainDefPtr def,
                  virDomainNetDefPtr net,
                  virQEMUCapsPtr qemuCaps,
                  int *vhostfd,
-                 int *vhostfdSize)
+                 size_t *vhostfdSize)
 {
     size_t i;
     const char *vhostnet_path = net->backend.vhost;
@@ -490,7 +490,7 @@ qemuOpenVhostNet(virDomainDefPtr def,
                                        "but is unavailable"));
                 goto error;
             }
-            VIR_WARN("Unable to open vhost-net. Opened so far %zu, requested %d",
+            VIR_WARN("Unable to open vhost-net. Opened so far %zu, requested %zu",
                      i, *vhostfdSize);
             *vhostfdSize = i;
             break;
@@ -4353,7 +4353,7 @@ qemuBuildNicDevStr(virDomainDefPtr def,
                    virDomainNetDefPtr net,
                    int vlan,
                    int bootindex,
-                   int vhostfdSize,
+                   size_t vhostfdSize,
                    virQEMUCapsPtr qemuCaps)
 {
     virBuffer buf = VIR_BUFFER_INITIALIZER;
@@ -4455,7 +4455,7 @@ qemuBuildNicDevStr(virDomainDefPtr def,
     if (usingVirtio && vhostfdSize > 1) {
         /* As advised at http://www.linux-kvm.org/page/Multiqueue
          * we should add vectors=2*N+2 where N is the vhostfdSize */
-        virBufferAsprintf(&buf, ",mq=on,vectors=%d", 2 * vhostfdSize + 2);
+        virBufferAsprintf(&buf, ",mq=on,vectors=%zu", 2 * vhostfdSize + 2);
     }
     if (vlan == -1)
         virBufferAsprintf(&buf, ",netdev=host%s", net->info.alias);
@@ -4488,9 +4488,9 @@ qemuBuildHostNetStr(virDomainNetDefPtr net,
                     char type_sep,
                     int vlan,
                     char **tapfd,
-                    int tapfdSize,
+                    size_t tapfdSize,
                     char **vhostfd,
-                    int vhostfdSize)
+                    size_t vhostfdSize)
 {
     bool is_tap = false;
     virBuffer buf = VIR_BUFFER_INITIALIZER;
@@ -7359,9 +7359,9 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
     int ret = -1;
     char *nic = NULL, *host = NULL;
     int *tapfd = NULL;
-    int tapfdSize = 0;
+    size_t tapfdSize = 0;
     int *vhostfd = NULL;
-    int vhostfdSize = 0;
+    size_t vhostfdSize = 0;
     char **tapfdName = NULL;
     char **vhostfdName = NULL;
     int actualType = virDomainNetGetActualType(net);
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index 6246a8552c..dcc7127324 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -98,9 +98,9 @@ char *qemuBuildHostNetStr(virDomainNetDefPtr net,
                           char type_sep,
                           int vlan,
                           char **tapfd,
-                          int tapfdSize,
+                          size_t tapfdSize,
                           char **vhostfd,
-                          int vhostfdSize);
+                          size_t vhostfdSize);
 
 /* Legacy, pre device support */
 char *qemuBuildNicStr(virDomainNetDefPtr net,
@@ -112,7 +112,7 @@ char *qemuBuildNicDevStr(virDomainDefPtr def,
                          virDomainNetDefPtr net,
                          int vlan,
                          int bootindex,
-                         int vhostfdSize,
+                         size_t vhostfdSize,
                          virQEMUCapsPtr qemuCaps);
 
 char *qemuDeviceDriveHostAlias(virDomainDiskDefPtr disk,
@@ -195,7 +195,7 @@ int qemuNetworkIfaceConnect(virDomainDefPtr def,
                             virDomainNetDefPtr net,
                             virQEMUCapsPtr qemuCaps,
                             int *tapfd,
-                            int *tapfdSize)
+                            size_t *tapfdSize)
     ATTRIBUTE_NONNULL(2);
 
 int qemuPhysIfaceConnect(virDomainDefPtr def,
@@ -208,7 +208,7 @@ int qemuOpenVhostNet(virDomainDefPtr def,
                      virDomainNetDefPtr net,
                      virQEMUCapsPtr qemuCaps,
                      int *vhostfd,
-                     int *vhostfdSize);
+                     size_t *vhostfdSize);
 
 int qemuNetworkPrepareDevices(virDomainDefPtr def);
 
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index bf1f69a1ff..6f62345e4b 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -825,10 +825,10 @@ int qemuDomainAttachNetDevice(virConnectPtr conn,
     qemuDomainObjPrivatePtr priv = vm->privateData;
     char **tapfdName = NULL;
     int *tapfd = NULL;
-    int tapfdSize = 0;
+    size_t tapfdSize = 0;
     char **vhostfdName = NULL;
     int *vhostfd = NULL;
-    int vhostfdSize = 0;
+    size_t vhostfdSize = 0;
     char *nicstr = NULL;
     char *netstr = NULL;
     virNetDevVPortProfilePtr vport = NULL;
diff --git a/src/util/virnetdevtap.c b/src/util/virnetdevtap.c
index 85688ab1e3..83b4131951 100644
--- a/src/util/virnetdevtap.c
+++ b/src/util/virnetdevtap.c
@@ -235,7 +235,7 @@ virNetDevProbeVnetHdr(int tapfd)
 int virNetDevTapCreate(char **ifname,
                        const char *tunpath,
                        int *tapfd,
-                       int tapfdSize,
+                       size_t tapfdSize,
                        unsigned int flags)
 {
     size_t i;
@@ -370,7 +370,7 @@ int virNetDevTapDelete(const char *ifname,
 int virNetDevTapCreate(char **ifname,
                        const char *tunpath ATTRIBUTE_UNUSED,
                        int *tapfd,
-                       int tapfdSize,
+                       size_t tapfdSize,
                        unsigned int flags ATTRIBUTE_UNUSED)
 {
     int s;
@@ -481,7 +481,7 @@ int virNetDevTapDelete(const char *ifname,
 int virNetDevTapCreate(char **ifname ATTRIBUTE_UNUSED,
                        const char *tunpath ATTRIBUTE_UNUSED,
                        int *tapfd ATTRIBUTE_UNUSED,
-                       int tapfdSize ATTRIBUTE_UNUSED,
+                       size_t tapfdSize ATTRIBUTE_UNUSED,
                        unsigned int flags ATTRIBUTE_UNUSED)
 {
     virReportSystemError(ENOSYS, "%s",
@@ -534,7 +534,7 @@ int virNetDevTapCreateInBridgePort(const char *brname,
                                    const unsigned char *vmuuid,
                                    const char *tunpath,
                                    int *tapfd,
-                                   int tapfdSize,
+                                   size_t tapfdSize,
                                    virNetDevVPortProfilePtr virtPortProfile,
                                    virNetDevVlanPtr virtVlan,
                                    unsigned int flags)
diff --git a/src/util/virnetdevtap.h b/src/util/virnetdevtap.h
index c0a4e15fc7..20dec58b7f 100644
--- a/src/util/virnetdevtap.h
+++ b/src/util/virnetdevtap.h
@@ -36,7 +36,7 @@
 int virNetDevTapCreate(char **ifname,
                        const char *tunpath,
                        int *tapfd,
-                       int tapfdSize,
+                       size_t tapfdSize,
                        unsigned int flags)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
 
@@ -68,7 +68,7 @@ int virNetDevTapCreateInBridgePort(const char *brname,
                                    const unsigned char *vmuuid,
                                    const char *tunpath,
                                    int *tapfd,
-                                   int tapfdSize,
+                                   size_t tapfdSize,
                                    virNetDevVPortProfilePtr virtPortProfile,
                                    virNetDevVlanPtr virtVlan,
                                    unsigned int flags)