diff --git a/src/libs/vdxf/dxflib/dl_codes.h b/src/libs/vdxf/dxflib/dl_codes.h
index 4cd116fad..2336b3685 100644
--- a/src/libs/vdxf/dxflib/dl_codes.h
+++ b/src/libs/vdxf/dxflib/dl_codes.h
@@ -32,9 +32,11 @@
 
 #include "dl_global.h"
 
-#if _MSC_VER > 1000
-#pragma once
-#endif // _MSC_VER > 1000
+#if defined(Q_CC_MSVC)
+    #if (_MSC_VER > 1000)
+    #pragma once
+    #endif // _MSC_VER > 1000
+#endif // Q_CC_MSVC
 
 #if defined(__OS2__)||defined(__EMX__)
 #define strcasecmp(s,t) stricmp(s,t)
diff --git a/src/libs/vdxf/dxflib/dl_exception.h b/src/libs/vdxf/dxflib/dl_exception.h
index fdca72963..506e194c8 100644
--- a/src/libs/vdxf/dxflib/dl_exception.h
+++ b/src/libs/vdxf/dxflib/dl_exception.h
@@ -28,9 +28,11 @@
 
 #include "dl_global.h"
 
-#if _MSC_VER > 1000
-#pragma once
-#endif // _MSC_VER > 1000
+#if defined(Q_CC_MSVC)
+    #if (_MSC_VER > 1000)
+    #pragma once
+    #endif // _MSC_VER > 1000
+#endif // Q_CC_MSVC
 
 /**
  * Used for exception handling.
diff --git a/src/libs/vdxf/dxflib/dl_writer.h b/src/libs/vdxf/dxflib/dl_writer.h
index ff744ba50..882033ede 100644
--- a/src/libs/vdxf/dxflib/dl_writer.h
+++ b/src/libs/vdxf/dxflib/dl_writer.h
@@ -32,9 +32,11 @@
 #include <strings.h>
 #endif
 
-#if _MSC_VER > 1000
-#pragma once
-#endif // _MSC_VER > 1000
+#if defined(Q_CC_MSVC)
+    #if (_MSC_VER > 1000)
+    #pragma once
+    #endif // _MSC_VER > 1000
+#endif // Q_CC_MSVC
 
 #include <iostream>
 #include <algorithm>
diff --git a/src/libs/vdxf/dxflib/dl_writer_ascii.cpp b/src/libs/vdxf/dxflib/dl_writer_ascii.cpp
index 319c34f23..f54a6fd1b 100644
--- a/src/libs/vdxf/dxflib/dl_writer_ascii.cpp
+++ b/src/libs/vdxf/dxflib/dl_writer_ascii.cpp
@@ -23,9 +23,11 @@
 **
 **********************************************************************/
 
-#if _MSC_VER > 1000
-#pragma once
-#endif // _MSC_VER > 1000
+#if defined(Q_CC_MSVC)
+    #if (_MSC_VER > 1000)
+    #pragma once
+    #endif // _MSC_VER > 1000
+#endif // Q_CC_MSVC
 
 #include <stdio.h>
 #include <string.h>
diff --git a/src/libs/vdxf/dxflib/dl_writer_ascii.h b/src/libs/vdxf/dxflib/dl_writer_ascii.h
index 6f8b4f965..51686de8c 100644
--- a/src/libs/vdxf/dxflib/dl_writer_ascii.h
+++ b/src/libs/vdxf/dxflib/dl_writer_ascii.h
@@ -28,9 +28,11 @@
 
 #include "dl_global.h"
 
-#if _MSC_VER > 1000
-#pragma once
-#endif // _MSC_VER > 1000
+#if defined(Q_CC_MSVC)
+    #if (_MSC_VER > 1000)
+    #pragma once
+    #endif // _MSC_VER > 1000
+#endif // Q_CC_MSVC
 
 #include "dl_writer.h"
 #include <fstream>