diff --git a/pwmfan.cpp b/pwmfan.cpp
index b09509b..fb7328c 100644
--- a/pwmfan.cpp
+++ b/pwmfan.cpp
@@ -47,6 +47,7 @@ volatile sig_atomic_t flag = 1;
 //    0 |  T_MIN    T_MAX      max[TEMP], celsius
 
 float calcPower(int temperature) {
+    float value = 0.0f;
     if (temperature < T_MIN) {
             value = 0.0f;
     }