diff --git a/src/hotspot/share/gc/shenandoah/shenandoahSimpleBitMap.hpp b/src/hotspot/share/gc/shenandoah/shenandoahSimpleBitMap.hpp
index 6b95303fb33..55d21b06e4b 100644
--- a/src/hotspot/share/gc/shenandoah/shenandoahSimpleBitMap.hpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahSimpleBitMap.hpp
@@ -80,6 +80,8 @@ private:
   bool is_forward_consecutive_ones(idx_t start_idx, idx_t count) const;
   bool is_backward_consecutive_ones(idx_t last_idx, idx_t count) const;
 
+  static inline uintx tail_mask(uintx bit_number);
+
 public:
 
   inline idx_t aligned_index(idx_t idx) const {
diff --git a/src/hotspot/share/gc/shenandoah/shenandoahSimpleBitMap.inline.hpp b/src/hotspot/share/gc/shenandoah/shenandoahSimpleBitMap.inline.hpp
index c047e1ed663..4582ab9a781 100644
--- a/src/hotspot/share/gc/shenandoah/shenandoahSimpleBitMap.inline.hpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahSimpleBitMap.inline.hpp
@@ -27,7 +27,7 @@
 
 #include "gc/shenandoah/shenandoahSimpleBitMap.hpp"
 
-inline uintx tail_mask(uintx bit_number) {
+inline uintx ShenandoahSimpleBitMap::tail_mask(uintx bit_number) {
   if (bit_number >= BitsPerWord) {
     return -1;
   }