diff --git a/code/__DEFINES/flags.dm b/code/__DEFINES/flags.dm
index a5abad45ac4..0d741f97a4a 100644
--- a/code/__DEFINES/flags.dm
+++ b/code/__DEFINES/flags.dm
@@ -12,7 +12,7 @@
 
 
 //check if all bitflags specified are present
-#define CHECK_MULTIPLE_BITFIELDS(flagvar, flags) ((flagvar & (flags)) == flags)
+#define CHECK_MULTIPLE_BITFIELDS(flagvar, flags) (((flagvar) & (flags)) == (flags))
 
 GLOBAL_LIST_INIT(bitflags, list(1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768))
 
@@ -159,4 +159,4 @@ GLOBAL_LIST_INIT(bitflags, list(1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 204
 
 //alternate appearance flags
 #define AA_TARGET_SEE_APPEARANCE (1<<0)
-#define AA_MATCH_TARGET_OVERLAYS (1<<1)
\ No newline at end of file
+#define AA_MATCH_TARGET_OVERLAYS (1<<1)