diff --git a/desktop_version/src/FileSystemUtils.cpp b/desktop_version/src/FileSystemUtils.cpp
index a93f936d..e499bb45 100644
--- a/desktop_version/src/FileSystemUtils.cpp
+++ b/desktop_version/src/FileSystemUtils.cpp
@@ -241,8 +241,6 @@ void FILESYSTEM_loadZip(const char* filename)
 	}
 }
 
-bool FILESYSTEM_assetsmounted = false;
-
 void FILESYSTEM_mountassets(const char* path)
 {
 	const size_t path_size = SDL_strlen(path);
@@ -288,8 +286,6 @@ void FILESYSTEM_mountassets(const char* path)
 		FILESYSTEM_mount(zip_data);
 
 		graphics.reloadresources();
-
-		FILESYSTEM_assetsmounted = true;
 	}
 	else if (zip_normal != NULL && endsWith(zip_normal, ".zip"))
 	{
@@ -323,8 +319,6 @@ void FILESYSTEM_mountassets(const char* path)
 			SDL_strlcpy(assetDir, zip_data, sizeof(assetDir));
 		}
 
-		FILESYSTEM_assetsmounted = true;
-
 		graphics.reloadresources();
 	}
 	else if (FILESYSTEM_exists(dir))
@@ -334,14 +328,10 @@ void FILESYSTEM_mountassets(const char* path)
 		FILESYSTEM_mount(dir);
 
 		graphics.reloadresources();
-
-		FILESYSTEM_assetsmounted = true;
 	}
 	else
 	{
 		puts("Custom asset directory does not exist");
-
-		FILESYSTEM_assetsmounted = false;
 	}
 }
 
@@ -358,7 +348,6 @@ void FILESYSTEM_unmountassets(void)
 	{
 		printf("Cannot unmount when no asset directory is mounted\n");
 	}
-	FILESYSTEM_assetsmounted = false;
 }
 
 bool FILESYSTEM_isAssetMounted(const char* filename)
diff --git a/desktop_version/src/FileSystemUtils.h b/desktop_version/src/FileSystemUtils.h
index e9c885f8..fd6b6d81 100644
--- a/desktop_version/src/FileSystemUtils.h
+++ b/desktop_version/src/FileSystemUtils.h
@@ -17,7 +17,6 @@ bool FILESYSTEM_isMounted(const char* filename);
 
 void FILESYSTEM_mount(const char *fname);
 void FILESYSTEM_loadZip(const char* filename);
-extern bool FILESYSTEM_assetsmounted;
 void FILESYSTEM_mountassets(const char *path);
 void FILESYSTEM_unmountassets(void);
 bool FILESYSTEM_isAssetMounted(const char* filename);
diff --git a/desktop_version/src/Graphics.cpp b/desktop_version/src/Graphics.cpp
index c47fa02e..ce677c7b 100644
--- a/desktop_version/src/Graphics.cpp
+++ b/desktop_version/src/Graphics.cpp
@@ -146,6 +146,11 @@ void Graphics::init(void)
     col_tb = 0;
 
     kludgeswnlinewidth = false;
+
+#ifndef NO_CUSTOM_LEVELS
+    tiles1_mounted = false;
+    tiles2_mounted = false;
+#endif
 }
 
 void Graphics::destroy(void)
@@ -710,10 +715,10 @@ void Graphics::drawsprite(int x, int y, int t, Uint32 c)
 }
 
 #ifndef NO_CUSTOM_LEVELS
-bool Graphics::shouldrecoloroneway(const int tilenum)
+bool Graphics::shouldrecoloroneway(const int tilenum, const bool mounted)
 {
     return (tilenum >= 14 && tilenum <= 17
-    && (!FILESYSTEM_assetsmounted
+    && (!mounted
     || ed.onewaycol_override));
 }
 #endif
@@ -729,7 +734,7 @@ void Graphics::drawtile( int x, int y, int t )
     SDL_Rect rect = { Sint16(x), Sint16(y), tiles_rect.w, tiles_rect.h };
 
 #if !defined(NO_CUSTOM_LEVELS)
-    if (shouldrecoloroneway(t))
+    if (shouldrecoloroneway(t, tiles1_mounted))
     {
         colourTransform thect = {ed.getonewaycol()};
         BlitSurfaceTinted(tiles[t], NULL, backBuffer, &rect, thect);
@@ -753,7 +758,7 @@ void Graphics::drawtile2( int x, int y, int t )
     SDL_Rect rect = { Sint16(x), Sint16(y), tiles_rect.w, tiles_rect.h };
 
 #if !defined(NO_CUSTOM_LEVELS)
-    if (shouldrecoloroneway(t))
+    if (shouldrecoloroneway(t, tiles2_mounted))
     {
         colourTransform thect = {ed.getonewaycol()};
         BlitSurfaceTinted(tiles2[t], NULL, backBuffer, &rect, thect);
@@ -3153,7 +3158,7 @@ void Graphics::drawforetile(int x, int y, int t)
 	setRect(rect, x,y,tiles_rect.w, tiles_rect.h);
 
 #if !defined(NO_CUSTOM_LEVELS)
-	if (shouldrecoloroneway(t))
+	if (shouldrecoloroneway(t, tiles1_mounted))
 	{
 		colourTransform thect = {ed.getonewaycol()};
 		BlitSurfaceTinted(tiles[t], NULL, foregroundBuffer, &rect, thect);
@@ -3177,7 +3182,7 @@ void Graphics::drawforetile2(int x, int y, int t)
 	setRect(rect, x,y,tiles_rect.w, tiles_rect.h);
 
 #if !defined(NO_CUSTOM_LEVELS)
-	if (shouldrecoloroneway(t))
+	if (shouldrecoloroneway(t, tiles2_mounted))
 	{
 		colourTransform thect = {ed.getonewaycol()};
 		BlitSurfaceTinted(tiles2[t], NULL, foregroundBuffer, &rect, thect);
@@ -3268,6 +3273,11 @@ void Graphics::reloadresources()
 
 	music.destroy();
 	music.init();
+
+#ifndef NO_CUSTOM_LEVELS
+	tiles1_mounted = FILESYSTEM_isAssetMounted("graphics/tiles.png");
+	tiles2_mounted = FILESYSTEM_isAssetMounted("graphics/tiles2.png");
+#endif
 }
 
 Uint32 Graphics::crewcolourreal(int t)
diff --git a/desktop_version/src/Graphics.h b/desktop_version/src/Graphics.h
index 67aef918..2664ca58 100644
--- a/desktop_version/src/Graphics.h
+++ b/desktop_version/src/Graphics.h
@@ -162,7 +162,7 @@ public:
 	void drawbackground(int t);
 	void updatebackground(int t);
 #ifndef NO_CUSTOM_LEVELS
-	bool shouldrecoloroneway(const int tilenum);
+	bool shouldrecoloroneway(const int tilenum, const bool mounted);
 #endif
 	void drawtile3( int x, int y, int t, int off, int height_subtract = 0 );
 	void drawtile2( int x, int y, int t );
@@ -187,6 +187,10 @@ public:
 	bool onscreen(int t);
 
 	void reloadresources(void);
+#ifndef NO_CUSTOM_LEVELS
+	bool tiles1_mounted;
+	bool tiles2_mounted;
+#endif
 
 
 	void menuoffrender(void);