diff --git a/ext/ghoul b/ext/ghoul
index ea8b9659bd..e6e209531f 160000
--- a/ext/ghoul
+++ b/ext/ghoul
@@ -1 +1 @@
-Subproject commit ea8b9659bdecce67f31143321db88ce0ee626ac0
+Subproject commit e6e209531fd10c56dcea54b9007852fe3d738771
diff --git a/include/openspace/interaction/shortcutmanager.h b/include/openspace/interaction/shortcutmanager.h
index caab550807..35027cf3c1 100644
--- a/include/openspace/interaction/shortcutmanager.h
+++ b/include/openspace/interaction/shortcutmanager.h
@@ -22,8 +22,8 @@
  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
  ****************************************************************************************/
 
-#ifndef __OPENSPACE_CORE___SHORTCUTSMANAGER___H__
-#define __OPENSPACE_CORE___SHORTCUTSMANAGER___H__
+#ifndef __OPENSPACE_CORE___SHORTCUTMANAGER___H__
+#define __OPENSPACE_CORE___SHORTCUTMANAGER___H__
 
 #include <ghoul/misc/boolean.h>
 #include <string>
@@ -56,4 +56,4 @@ private:
 
 } // namespace openspace::interaction
 
-#endif // __OPENSPACE_CORE___SHORTCUTSMANAGER___H__
+#endif // __OPENSPACE_CORE___SHORTCUTMANAGER___H__
diff --git a/support/coding/check_style_guide.py b/support/coding/check_style_guide.py
index 93b3e98e72..7914125588 100644
--- a/support/coding/check_style_guide.py
+++ b/support/coding/check_style_guide.py
@@ -633,7 +633,7 @@ check_files(
 )
 check_files(
     [basePath + 'apps/**/*.inl'],
-    [basePath + 'apps/**/ext/**/*.h'],
+    [basePath + 'apps/**/ext/**/*.inl'],
     'openspace_app',
     check_inline_file
 )