diff --git a/includes/defines.h b/includes/defines.h
index eabfbf59f..0f80ab69a 100644
--- a/includes/defines.h
+++ b/includes/defines.h
@@ -62,6 +62,18 @@ typedef unsigned short pixel;
 typedef unsigned int pixel;
 #endif
 
+#define SURF_RANGE     10
+#define NORMAL_MIN_EST 3
+#define NORMAL_INTERP  20
+#define NORMAL_FRAC    16
+
+#define REFRACT        0x80000000
+
+/* heavy flint glass, for awesome refraction/dispersion
+   this way you can make roof prisms easily */
+#define GLASS_IOR      1.9
+#define GLASS_DISP     0.07
+
 typedef unsigned char uint8;
 
 extern int amd;
diff --git a/src/powder.c b/src/powder.c
index d29748949..c86409f81 100644
--- a/src/powder.c
+++ b/src/powder.c
@@ -188,17 +188,6 @@ int try_move(int i, int x, int y, int nx, int ny)
 
     return 1;
 }
-#define SURF_RANGE     10
-#define NORMAL_MIN_EST 3
-#define NORMAL_INTERP  20
-#define NORMAL_FRAC    16
-
-#define REFRACT        0x80000000
-
-/* heavy flint glass, for awesome refraction/dispersion
-   this way you can make roof prisms easily */
-#define GLASS_IOR      1.9
-#define GLASS_DISP     0.07
 
 static unsigned direction_to_map(float dx, float dy)
 {