diff --git a/CMakeLists.txt b/CMakeLists.txt
index 32bb68214..c2ee1713a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -524,6 +524,8 @@ set(OC_CLONK_SOURCES
 	src/gui/C4GameOptions.h
 	src/gui/C4GameOverDlg.cpp
 	src/gui/C4GameOverDlg.h
+	src/gui/C4GfxErrorDlg.cpp
+	src/gui/C4GfxErrorDlg.h
 	src/gui/C4GuiButton.cpp
 	src/gui/C4GuiCheckBox.cpp
 	src/gui/C4GuiComboBox.cpp
@@ -1077,8 +1079,6 @@ add_library(libopenclonk
 	src/graphics/StdPNG.h
 	src/gui/C4Folder.cpp
 	src/gui/C4Folder.h
-	src/gui/C4GfxErrorDlg.cpp
-	src/gui/C4GfxErrorDlg.h
 	src/landscape/C4MapScriptAlgo.cpp
 	src/landscape/C4MassMover.cpp
 	src/landscape/C4MassMover.h