diff --git a/src/libs/ifc/ifcdef.h b/src/libs/ifc/ifcdef.h
index 9f72d92da..4dceb4b48 100644
--- a/src/libs/ifc/ifcdef.h
+++ b/src/libs/ifc/ifcdef.h
@@ -31,7 +31,6 @@
 
 #include <QtGlobal>
 #include "../vmisc/def.h"
-#include <ciso646> //for msvc
 
 extern const QString CustomMSign;
 extern const QString CustomIncrSign;
diff --git a/src/libs/vdxf/dxfdef.h b/src/libs/vdxf/dxfdef.h
index 6e5da7729..234db98d8 100644
--- a/src/libs/vdxf/dxfdef.h
+++ b/src/libs/vdxf/dxfdef.h
@@ -30,7 +30,10 @@
 #define DXFDEF_H
 
 #include <QtGlobal>
-#include <ciso646> //for msvc
+
+#ifdef Q_CC_MSVC
+    #include <ciso646>
+#endif /* Q_CC_MSVC */
 
 enum class VarMeasurement : unsigned char { English=0, Metric=1 };
 
diff --git a/src/libs/vlayout/vlayoutdef.h b/src/libs/vlayout/vlayoutdef.h
index a5e86c87d..19fbcc297 100644
--- a/src/libs/vlayout/vlayoutdef.h
+++ b/src/libs/vlayout/vlayoutdef.h
@@ -29,7 +29,9 @@
 #ifndef VLAYOUTDEF_H
 #define VLAYOUTDEF_H
 
-#include <ciso646> //for msvc
+#ifdef Q_CC_MSVC
+    #include <ciso646>
+#endif /* Q_CC_MSVC */
 
 enum class EquidistantType : char { OpenEquidistant, CloseEquidistant };
 
diff --git a/src/libs/vmisc/def.h b/src/libs/vmisc/def.h
index 14bc77b8f..585a0fea7 100644
--- a/src/libs/vmisc/def.h
+++ b/src/libs/vmisc/def.h
@@ -37,7 +37,10 @@
 #endif /* Q_OS_WIN */
 
 #include "debugbreak.h"
-#include <ciso646> //for msvc
+
+#ifdef Q_CC_MSVC
+    #include <ciso646>
+#endif /* Q_CC_MSVC */
 
 class QComboBox;