diff --git a/desmume/src/cp15.c b/desmume/src/cp15.c
index a72c95a6b..d8ff7b071 100644
--- a/desmume/src/cp15.c
+++ b/desmume/src/cp15.c
@@ -216,7 +216,7 @@ void armcp15_maskPrecalc(armcp15_t *armcp15)
 	precalc(7) ;
 }
 
-BOOL armcp15_isAccessAllowed(armcp15_t *armcp15,u32 address,u32 access)
+INLINE BOOL armcp15_isAccessAllowed(armcp15_t *armcp15,u32 address,u32 access)
 {
 	int i ;
 	if (!(armcp15->ctrl & 1)) return TRUE ;        /* protection checking is not enabled */
diff --git a/desmume/src/cp15.h b/desmume/src/cp15.h
index c00e3625d..49496f3e5 100644
--- a/desmume/src/cp15.h
+++ b/desmume/src/cp15.h
@@ -78,7 +78,7 @@ BOOL armcp15_load(armcp15_t *armcp15, u8 CRd, u8 adr);
 BOOL armcp15_store(armcp15_t *armcp15, u8 CRd, u8 adr);
 BOOL armcp15_moveCP2ARM(armcp15_t *armcp15, u32 * R, u8 CRn, u8 CRm, u8 opcode1, u8 opcode2);
 BOOL armcp15_moveARM2CP(armcp15_t *armcp15, u32 val, u8 CRn, u8 CRm, u8 opcode1, u8 opcode2);
-BOOL armcp15_isAccessAllowed(armcp15_t *armcp15,u32 address,u32 access) ;
+INLINE BOOL armcp15_isAccessAllowed(armcp15_t *armcp15,u32 address,u32 access) ;
 
 
 #define CP15_ACCESS_WRITE         0