diff --git a/generator/gen-utils.c b/generator/gen-utils.c
index b299f7b..fa0fa99 100644
--- a/generator/gen-utils.c
+++ b/generator/gen-utils.c
@@ -15,7 +15,7 @@
 	lfsr = seed;
 }
 
-UINT32 cper_rand()
+UINT32 cper_rand(void)
 {
 	lfsr |= lfsr == 0; // if x == 0, set x = 1 instead
 	lfsr ^= (lfsr & 0x0007ffff) << 13;