diff --git a/target/i386/hvf/x86_cpuid.c b/target/i386/hvf/x86_cpuid.c
index 3a116548a3..492e8bfc80 100644
--- a/target/i386/hvf/x86_cpuid.c
+++ b/target/i386/hvf/x86_cpuid.c
@@ -32,7 +32,7 @@
 static bool cached_xcr0;
 static uint64_t supported_xcr0;
 
-static void cache_host_xcr0()
+static void cache_host_xcr0(void)
 {
     if (cached_xcr0) {
         return;