diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 03a3fe207f85b0c754f4e44c448264c42ab3b367..fde9969bed1eb09c549dbedc124a8308a8c9040b 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -3407,6 +3407,7 @@ qemuBuildNumaCPUArgStr(char *cpumask, virBufferPtr buf)
     int i, first, last;
     int cpuSet = 0;
 
+    first = last = 0;
     for (i = 0; i < VIR_DOMAIN_CPUMASK_LEN; i++) {
         if (cpumask[i]) {
             if (cpuSet) {