diff --git a/decomp.h b/decomp.h
index ce8729e5..c99f0eac 100644
--- a/decomp.h
+++ b/decomp.h
@@ -11,3 +11,10 @@
 // get the N versions.
 #define FLAGS_ZERO (_FLAGS & 0x40) /* JZ */
 // ----------------
+
+// Alternate version that sets the value first
+#define OUTW2(port, val) __asm { \
+	mov ax, val; \
+	mov dx, port; \
+	out dx, ax; \
+}
diff --git a/th01/hardware/egcscopy.c b/th01/hardware/egcscopy.c
index 4c78319a..8e9787ed 100644
--- a/th01/hardware/egcscopy.c
+++ b/th01/hardware/egcscopy.c
@@ -1,9 +1,4 @@
-// Alternate version that sets the value first
-#define OUTW2(port, val) __asm { \
-	mov ax, val; \
-	mov dx, port; \
-	out dx, ax; \
-}
+#include "decomp.h"
 
 void pascal egc_start_copy(void)
 {