diff --git a/src/hb-atomic-private.hh b/src/hb-atomic-private.hh
index 100ba53..2d56757 100644
--- a/src/hb-atomic-private.hh
+++ b/src/hb-atomic-private.hh
@@ -124,13 +124,13 @@
 #include <builtins.h>
 
 
-static inline int hb_fetch_and_add(volatile int* AI, unsigned int V) {
+static inline int _hb_fetch_and_add(volatile int* AI, unsigned int V) {
   __lwsync();
   int result = __fetch_and_add(AI, V);
   __isync();
   return result;
 }
-static inline int hb_compare_and_swaplp(volatile long* P, long O, long N) {
+static inline int _hb_compare_and_swaplp(volatile long* P, long O, long N) {
   __sync();
   int result = __compare_and_swaplp (P, &O, N);
   __sync();
@@ -139,10 +139,10 @@
 
 typedef int hb_atomic_int_impl_t;
 #define HB_ATOMIC_INT_IMPL_INIT(V) (V)
-#define hb_atomic_int_impl_add(AI, V)           hb_fetch_and_add (&(AI), (V))
+#define hb_atomic_int_impl_add(AI, V)           _hb_fetch_and_add (&(AI), (V))
 
 #define hb_atomic_ptr_impl_get(P)               (__sync(), (void *) *(P))
-#define hb_atomic_ptr_impl_cmpexch(P,O,N)       hb_compare_and_swaplp ((long*)(P), (long)(O), (long)(N))
+#define hb_atomic_ptr_impl_cmpexch(P,O,N)       _hb_compare_and_swaplp ((long*)(P), (long)(O), (long)(N))
 
 #elif !defined(HB_NO_MT)