diff --git a/pwmfan.cpp b/pwmfan.cpp
index ee5a8fb..3322528 100644
--- a/pwmfan.cpp
+++ b/pwmfan.cpp
@@ -60,7 +60,7 @@ float calcPower(int temperature) {
 	if (temperature > T_MAX) {
         value = 1.0f;
     }
-    if INVERT_CONTROL_CURVE {
+    if (INVERT_CONTROL_CURVE) {
         return (1.0f-value);
     } else {
         return value;