diff --git a/src/slic3r/GUI/ImGuiWrapper.cpp b/src/slic3r/GUI/ImGuiWrapper.cpp
index 7949389041..98baf1b364 100644
--- a/src/slic3r/GUI/ImGuiWrapper.cpp
+++ b/src/slic3r/GUI/ImGuiWrapper.cpp
@@ -7,9 +7,11 @@
 
 #include <GL/glew.h>
 
+#include <imgui/imgui.h>
+
 namespace Slic3r {
 namespace GUI {
-    
+
 
 ImGuiWrapper::ImGuiWrapper()
     : m_glsl_version_string("")
diff --git a/src/slic3r/GUI/ImGuiWrapper.hpp b/src/slic3r/GUI/ImGuiWrapper.hpp
index ed1ea4ae04..ce795d9541 100644
--- a/src/slic3r/GUI/ImGuiWrapper.hpp
+++ b/src/slic3r/GUI/ImGuiWrapper.hpp
@@ -1,11 +1,12 @@
 #ifndef slic3r_ImGuiWrapper_hpp_
 #define slic3r_ImGuiWrapper_hpp_
 
-#include <imgui\imgui.h>
 #include <string>
 #include <map>
 
 class wxMouseEvent;
+class ImFont;
+class ImDrawData;
 
 namespace Slic3r {
 namespace GUI {