diff --git a/src/Audacity.h b/src/Audacity.h
index 536ba922d..1ad029cbb 100644
--- a/src/Audacity.h
+++ b/src/Audacity.h
@@ -153,10 +153,10 @@ void QuitAudacity();
 #endif
 
 // These macros are used widely, so declared here.
-#define QUANTIZED_TIME(time, rate) ((double)((sampleCount)floor(((double)(time) * (rate)) + 0.5))) / (rate)
+#define QUANTIZED_TIME(time, rate) (((double)((sampleCount)floor(((double)(time) * (rate)) + 0.5))) / (rate))
 // dB - linear amplitude convesions
-#define DB_TO_LINEAR(x) pow(10.0, x / 20.0)
-#define LINEAR_TO_DB(x) 20.0 * log10(x)
+#define DB_TO_LINEAR(x) (pow(10.0, (x) / 20.0))
+#define LINEAR_TO_DB(x) (20.0 * log10(x))
 
 // Marks strings for extraction only...must use wxGetTranslation() to translate.
 #define XO(s) wxT(s)