diff --git a/include/roaring/portability.h b/include/roaring/portability.h
index 9e51f2bf9..fba2a4b25 100644
--- a/include/roaring/portability.h
+++ b/include/roaring/portability.h
@@ -225,8 +225,8 @@ inline int roaring_leading_zeroes(unsigned long long input_num) {
 #ifndef CROARING_INTRINSICS
 #define CROARING_INTRINSICS 1
 #define roaring_unreachable __builtin_unreachable()
-inline int roaring_trailing_zeroes(unsigned long long input_num) { return __builtin_ctzll(input_num); }
-inline int roaring_leading_zeroes(unsigned long long input_num) { return __builtin_clzll(input_num); }
+static inline int roaring_trailing_zeroes(unsigned long long input_num) { return __builtin_ctzll(input_num); }
+static inline int roaring_leading_zeroes(unsigned long long input_num) { return __builtin_clzll(input_num); }
 #endif
 
 #if CROARING_REGULAR_VISUAL_STUDIO