diff --git a/src/core/arm/skyeye_common/vfp/vfp_helper.h b/src/core/arm/skyeye_common/vfp/vfp_helper.h
index f0896fc875..b1949603aa 100644
--- a/src/core/arm/skyeye_common/vfp/vfp_helper.h
+++ b/src/core/arm/skyeye_common/vfp/vfp_helper.h
@@ -44,7 +44,7 @@
 #define pr_info //printf
 #define pr_debug //printf
 
-static u32 fls(int x);
+static u32 fls(ARMword x);
 #define do_div(n, base) {n/=base;}
 
 /* From vfpinstr.h */
@@ -502,7 +502,7 @@ struct op {
 	u32 flags;
 };
 
-static u32 fls(int x)
+static u32 fls(ARMword x)
 {
 	int r = 32;