diff --git a/nsprpub/pr/include/private/primpl.h b/nsprpub/pr/include/private/primpl.h
index 4677892b1d3e..5cfbf3a262be 100644
--- a/nsprpub/pr/include/private/primpl.h
+++ b/nsprpub/pr/include/private/primpl.h
@@ -1527,13 +1527,13 @@ PR_EXTERN(PRIntn) _PR_MD_PUT_ENV(const char *name);
 void _PR_MD_INIT_ATOMIC(void);
 #define    _PR_MD_INIT_ATOMIC _MD_INIT_ATOMIC
 
-PR_EXTERN(void) _PR_MD_ATOMIC_INCREMENT(PRInt32 *);
+PR_EXTERN(PRInt32) _PR_MD_ATOMIC_INCREMENT(PRInt32 *);
 #define    _PR_MD_ATOMIC_INCREMENT _MD_ATOMIC_INCREMENT
 
-PR_EXTERN(void) _PR_MD_ATOMIC_DECREMENT(PRInt32 *);
+PR_EXTERN(PRInt32) _PR_MD_ATOMIC_DECREMENT(PRInt32 *);
 #define    _PR_MD_ATOMIC_DECREMENT _MD_ATOMIC_DECREMENT
 
-PR_EXTERN(void) _PR_MD_ATOMIC_SET(PRInt32 *, PRInt32);
+PR_EXTERN(PRInt32) _PR_MD_ATOMIC_SET(PRInt32 *, PRInt32);
 #define    _PR_MD_ATOMIC_SET _MD_ATOMIC_SET
 
 /* Segment related */