diff --git a/gpu_tonemapper/glengine.cpp b/gpu_tonemapper/glengine.cpp
index e5c8e68..2351d56 100644
--- a/gpu_tonemapper/glengine.cpp
+++ b/gpu_tonemapper/glengine.cpp
@@ -158,7 +158,7 @@
 void dumpShaderLog(int shader)
 //-----------------------------------------------------------------------------
 {
-  int success;
+  int success = 0;
   GLchar infoLog[512];
   GL(glGetShaderiv(shader, GL_COMPILE_STATUS, &success));
   if (!success) {