diff --git a/libavcodec/psymodel.h b/libavcodec/psymodel.h
index d1a126a88f..75261ba4be 100644
--- a/libavcodec/psymodel.h
+++ b/libavcodec/psymodel.h
@@ -29,7 +29,7 @@
 /** maximum number of channels */
 #define PSY_MAX_CHANS 20
 
-#define AAC_CUTOFF(s) (s->bit_rate ? FFMIN3(4000 + s->bit_rate/8, 12000 + s->bit_rate/32, s->sample_rate / 2) : (s->sample_rate / 2))
+#define AAC_CUTOFF(s) ((s)->bit_rate ? FFMIN3(4000 + (s)->bit_rate/8, 12000 + (s)->bit_rate/32, (s)->sample_rate / 2) : ((s)->sample_rate / 2))
 
 /**
  * single band psychoacoustic information