diff --git a/src/region.cc b/src/region.cc
index f6934d4..3a80083 100644
--- a/src/region.cc
+++ b/src/region.cc
@@ -6,7 +6,8 @@
 #include <limits.h>
 #include <string.h>
 
-char _aNull[] = "<null>";
+// 0x50D394
+static char _aNull[] = "<null>";
 
 // Probably recalculates bounding box of the region.
 //
diff --git a/src/region.h b/src/region.h
index 516ab3e..22282d4 100644
--- a/src/region.h
+++ b/src/region.h
@@ -37,8 +37,6 @@ typedef struct Region {
     void* userData;
 } Region;
 
-extern char _aNull[];
-
 void _regionSetBound(Region* region);
 Region* regionCreate(int a1);
 void regionAddPoint(Region* region, int x, int y);