diff --git a/src/engine/platform/genesis.h b/src/engine/platform/genesis.h
index a6b082542..ac2e54323 100644
--- a/src/engine/platform/genesis.h
+++ b/src/engine/platform/genesis.h
@@ -19,8 +19,8 @@
 
 #ifndef _GENESIS_H
 #define _GENESIS_H
-#include "fmshared_OPN.h"
 
+#include "fmshared_OPN.h"
 #include "../../../extern/Nuked-OPN2/ym3438.h"
 #include "sound/ymfm/ymfm_opn.h"
 
diff --git a/src/engine/platform/genesisext.h b/src/engine/platform/genesisext.h
index 32678f511..eec093a8e 100644
--- a/src/engine/platform/genesisext.h
+++ b/src/engine/platform/genesisext.h
@@ -17,6 +17,9 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#ifndef _GENESISEXT_H
+#define _GENESISEXT_H
+
 #include "../dispatch.h"
 
 #include "genesis.h"
@@ -43,3 +46,5 @@ class DivPlatformGenesisExt: public DivPlatformGenesis {
     void quit();
     ~DivPlatformGenesisExt();
 };
+
+#endif
diff --git a/src/engine/platform/ym2203ext.h b/src/engine/platform/ym2203ext.h
index 27d025315..14535e2d1 100644
--- a/src/engine/platform/ym2203ext.h
+++ b/src/engine/platform/ym2203ext.h
@@ -44,4 +44,4 @@ class DivPlatformYM2203Ext: public DivPlatformYM2203 {
     ~DivPlatformYM2203Ext();
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/engine/platform/ym2608ext.h b/src/engine/platform/ym2608ext.h
index e35c62e67..01afb3617 100644
--- a/src/engine/platform/ym2608ext.h
+++ b/src/engine/platform/ym2608ext.h
@@ -44,4 +44,4 @@ class DivPlatformYM2608Ext: public DivPlatformYM2608 {
     ~DivPlatformYM2608Ext();
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/engine/platform/ym2610bext.h b/src/engine/platform/ym2610bext.h
index 0493344de..c77649597 100644
--- a/src/engine/platform/ym2610bext.h
+++ b/src/engine/platform/ym2610bext.h
@@ -44,4 +44,4 @@ class DivPlatformYM2610BExt: public DivPlatformYM2610B {
     ~DivPlatformYM2610BExt();
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/src/engine/platform/ym2610ext.h b/src/engine/platform/ym2610ext.h
index d4a9294ed..5e78c53f4 100644
--- a/src/engine/platform/ym2610ext.h
+++ b/src/engine/platform/ym2610ext.h
@@ -44,4 +44,4 @@ class DivPlatformYM2610Ext: public DivPlatformYM2610 {
     ~DivPlatformYM2610Ext();
 };
 
-#endif
\ No newline at end of file
+#endif