diff --git a/mtb_wm8960.cpp b/mtb_wm8960.cpp
index 1db686e..99805af 100644
--- a/mtb_wm8960.cpp
+++ b/mtb_wm8960.cpp
@@ -773,9 +773,9 @@ bool mtb_wm8960_adjust_speaker_output_volume(uint8_t volume)
 
 bool mtb_wm8960_set_output_volume(uint8_t volume){
     bool result = true;
-    if (enabled_features & WM8960_FEATURE_SPEAKER == WM8960_FEATURE_SPEAKER )
+    if ((enabled_features & WM8960_FEATURE_SPEAKER) == WM8960_FEATURE_SPEAKER )
         result = result && mtb_wm8960_adjust_speaker_output_volume(volume);
-    if (enabled_features & WM8960_FEATURE_HEADPHONE == WM8960_FEATURE_HEADPHONE)
+    if ((enabled_features & WM8960_FEATURE_HEADPHONE) == WM8960_FEATURE_HEADPHONE)
         result = result && mtb_wm8960_adjust_heaphone_output_volume(volume);
     return result;
 }