diff --git a/src/MacVim/MMVimController.m b/src/MacVim/MMVimController.m
index 1c9bb11646..45a1e12abc 100644
--- a/src/MacVim/MMVimController.m
+++ b/src/MacVim/MMVimController.m
@@ -35,6 +35,7 @@
 #import "Miscellaneous.h"
 #import "MMCoreTextView.h"
 #import "MMWindow.h"
+#import "blur.h"
 
 
 static NSString *MMDefaultToolbarImageName = @"Attention";
diff --git a/src/MacVim/MMWindow.h b/src/MacVim/MMWindow.h
index 30941b78d0..d55100e01b 100644
--- a/src/MacVim/MMWindow.h
+++ b/src/MacVim/MMWindow.h
@@ -9,6 +9,7 @@
  */
 
 #import "MacVim.h"
+#import "blur.h"
 
 
 
diff --git a/src/MacVim/MMWindowController.h b/src/MacVim/MMWindowController.h
index ef54d46a1a..68889fca58 100644
--- a/src/MacVim/MMWindowController.h
+++ b/src/MacVim/MMWindowController.h
@@ -9,6 +9,7 @@
  */
 
 #import "MacVim.h"
+#import "blur.h"
 
 
 
diff --git a/src/MacVim/blur.h b/src/MacVim/blur.h
new file mode 100644
index 0000000000..f5129dbf47
--- /dev/null
+++ b/src/MacVim/blur.h
@@ -0,0 +1,3 @@
+#if defined(MAC_OS_X_VERSION_10_5) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5)
+# define BLUR_TRANSPARENCY
+#endif
diff --git a/src/vim.h b/src/vim.h
index 0946f2d227..4c93908dd2 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1752,8 +1752,8 @@ typedef int proftime_T;	    /* dummy for function prototypes */
 #endif
 
 /* Needs to be before option.h, which uses BLUR_TRANSPARENCY */
-#if defined(FEAT_TRANSPARENCY) && defined(MAC_OS_X_VERSION_10_5) && (MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5)
-# define BLUR_TRANSPARENCY
+#ifdef FEAT_TRANSPARENCY
+# include "MacVim/blur.h"
 #endif
 
 /* Include option.h before structs.h, because the number of window-local and