diff --git a/src/slic3r/GUI/OpenGLManager.cpp b/src/slic3r/GUI/OpenGLManager.cpp
index b12821116..5af621eea 100644
--- a/src/slic3r/GUI/OpenGLManager.cpp
+++ b/src/slic3r/GUI/OpenGLManager.cpp
@@ -1,4 +1,4 @@
-#include "libslic3r/libslic3r.h"
+#include "libslic3r/libslic3r.h"
 #include "OpenGLManager.hpp"
 
 #include "GUI.hpp"