diff --git a/opengl/libs/glestrace.h b/opengl/libs/glestrace.h
index a08f97b..868b18d 100644
--- a/opengl/libs/glestrace.h
+++ b/opengl/libs/glestrace.h
@@ -30,7 +30,7 @@
 void GLTrace_eglSwapBuffers(void*, void*);
 
 /* Start and stop GL Tracing. */
-void GLTrace_start();
+int GLTrace_start();
 void GLTrace_stop();
 
 /* Obtain the gl_hooks structure filled with the trace implementation for all GL functions. */