diff --git a/calculations.cpp b/calculations.cpp
index 8092072..4f6fc03 100644
--- a/calculations.cpp
+++ b/calculations.cpp
@@ -820,7 +820,7 @@ double z_eff_atima14(double pz, double T, double tz){
     double qmean = 0.0;
     #ifdef GLOBAL
     double qpb;
-    double qhigh,qwinger,qglobal;
+    double qhigh,qwinger,qglobal=0.0;
     double c1 = 1.4;
     double c2 = 0.28;
     double c3 = 0.04;