diff --git a/code/D3MFExporter.cpp b/code/D3MFExporter.cpp
index 162d20764..229e3f261 100644
--- a/code/D3MFExporter.cpp
+++ b/code/D3MFExporter.cpp
@@ -324,5 +324,5 @@ void D3MFExporter::writeRelInfoToFile( const std::string &folder, const std::str
 } // Namespace D3MF
 } // Namespace Assimp
 
-#endif // ASSIMP_BUILD_NO3MF_EXPORTER
+#endif // ASSIMP_BUILD_NO_3MF_EXPORTER
 #endif // ASSIMP_BUILD_NO_EXPORT
diff --git a/code/D3MFExporter.h b/code/D3MFExporter.h
index 16efabf29..b6be73976 100644
--- a/code/D3MFExporter.h
+++ b/code/D3MFExporter.h
@@ -59,7 +59,7 @@ class IOStream;
 namespace D3MF {
 
 #ifndef ASSIMP_BUILD_NO_EXPORT
-#ifndef ASSIMP_BUILD_NO3MF_EXPORTER
+#ifndef ASSIMP_BUILD_NO_3MF_EXPORTER
 
 struct OpcPackageRelationship;
 
@@ -95,7 +95,7 @@ private:
     std::vector<OpcPackageRelationship*> mRelations;
 };
 
-#endif // ASSIMP_BUILD_NO3MF_EXPORTER
+#endif // ASSIMP_BUILD_NO_3MF_EXPORTER
 #endif // ASSIMP_BUILD_NO_EXPORT
 
 } // Namespace D3MF
diff --git a/code/Exporter.cpp b/code/Exporter.cpp
index 3fc31a722..0281e4e99 100644
--- a/code/Exporter.cpp
+++ b/code/Exporter.cpp
@@ -165,7 +165,7 @@ Exporter::ExportFormatEntry gExporters[] =
     Exporter::ExportFormatEntry( "x3d", "Extensible 3D", "x3d" , &ExportSceneX3D, 0 ),
 #endif
 
-#ifndef ASSIMP_BUILD_NO3MF_EXPORTER
+#ifndef ASSIMP_BUILD_NO_3MF_EXPORTER
     Exporter::ExportFormatEntry( "3mf", "The 3MF-File-Format", "3mf", &ExportScene3MF, 0 )
 #endif
 };