diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b403f3..8559b18 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -148,7 +148,7 @@ include_directories (${PROJECT_SOURCE_DIR} ${PROJECT_BINARY_DIR})
 
 # Generate IRC replies--we need a custom target because of the multiple outputs
 add_custom_command (OUTPUT xD-replies.c xD.msg
-	COMMAND ${PROJECT_SOURCE_DIR}/xD-gen-replies.sh
+	COMMAND env LC_ALL=C awk -f ${PROJECT_SOURCE_DIR}/xD-gen-replies.awk
 		> xD-replies.c < ${PROJECT_SOURCE_DIR}/xD-replies
 	DEPENDS ${PROJECT_SOURCE_DIR}/xD-replies
 	COMMENT "Generating files from the list of server numerics")
diff --git a/xD-gen-replies.awk b/xD-gen-replies.awk
new file mode 100755
index 0000000..c9e8882
--- /dev/null
+++ b/xD-gen-replies.awk
@@ -0,0 +1,29 @@
+#!/usr/bin/awk -f
+BEGIN {
+	# The message catalog is a by-product
+	msg = "xD.msg"
+	print "$quote \"" > msg;
+	print "$set 1" > msg;
+}
+
+/^[0-9]+ *IRC_(ERR|RPL)_[A-Z]+ *".*"$/ {
+	match($0, /".*"/);
+	ids[$1] = $2;
+	texts[$2] = substr($0, RSTART, RLENGTH);
+	print $1 " " texts[$2] > msg
+}
+
+END {
+	printf("enum\n{")
+	for (i in ids) {
+		if (seen_first)
+			printf(",")
+		seen_first = 1
+		printf("\n\t%s = %s", ids[i], i)
+	}
+	print "\n};\n"
+	print "static const char *g_default_replies[] =\n{"
+	for (i in ids)
+		print "\t[" ids[i] "] = " texts[ids[i]] ","
+	print "};"
+}
diff --git a/xD-gen-replies.sh b/xD-gen-replies.sh
deleted file mode 100755
index 0fcbbba..0000000
--- a/xD-gen-replies.sh
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/bin/sh
-LC_ALL=C exec awk '
-	BEGIN {
-		# The message catalog is a by-product
-		msg = "xD.msg"
-		print "$quote \"" > msg;
-		print "$set 1" > msg;
-	}
-	/^[0-9]+ *IRC_(ERR|RPL)_[A-Z]+ *".*"$/ {
-		match($0, /".*"/);
-		ids[$1] = $2;
-		texts[$2] = substr($0, RSTART, RLENGTH);
-		print $1 " " texts[$2] > msg
-	}
-	END {
-		printf("enum\n{")
-		for (i in ids) {
-			if (seen_first)
-				printf(",")
-			seen_first = 1
-			printf("\n\t%s = %s", ids[i], i)
-		}
-		print "\n};\n"
-		print "static const char *g_default_replies[] =\n{"
-		for (i in ids)
-			print "\t[" ids[i] "] = " texts[ids[i]] ","
-		print "};"
-	}'