diff --git a/core/iwasm/aot/aot_intrinsic.c b/core/iwasm/aot/aot_intrinsic.c
index 252ef7056..fcc2fda9d 100644
--- a/core/iwasm/aot/aot_intrinsic.c
+++ b/core/iwasm/aot/aot_intrinsic.c
@@ -194,7 +194,7 @@ aot_intrinsic_clz_i32(uint32 type)
     return num;
 }
 
-uint32
+uint64
 aot_intrinsic_clz_i64(uint64 type)
 {
     uint32 num = 0;
@@ -220,7 +220,7 @@ aot_intrinsic_ctz_i32(uint32 type)
     return num;
 }
 
-uint32
+uint64
 aot_intrinsic_ctz_i64(uint64 type)
 {
     uint32 num = 0;
@@ -244,7 +244,7 @@ aot_intrinsic_popcnt_i32(uint32 u)
     return ret;
 }
 
-uint32
+uint64
 aot_intrinsic_popcnt_i64(uint64 u)
 {
     uint32 ret = 0;
diff --git a/core/iwasm/aot/aot_intrinsic.h b/core/iwasm/aot/aot_intrinsic.h
index f065a5ad2..e54c82516 100644
--- a/core/iwasm/aot/aot_intrinsic.h
+++ b/core/iwasm/aot/aot_intrinsic.h
@@ -186,19 +186,19 @@ aot_intrinsic_fmax_f64(float64 a, float64 b);
 uint32
 aot_intrinsic_clz_i32(uint32 type);
 
-uint32
+uint64
 aot_intrinsic_clz_i64(uint64 type);
 
 uint32
 aot_intrinsic_ctz_i32(uint32 type);
 
-uint32
+uint64
 aot_intrinsic_ctz_i64(uint64 type);
 
 uint32
 aot_intrinsic_popcnt_i32(uint32 u);
 
-uint32
+uint64
 aot_intrinsic_popcnt_i64(uint64 u);
 
 float32