diff --git a/src/pkg/debug/macho/testdata/hello.b b/src/pkg/debug/macho/testdata/hello.b
deleted file mode 100644
index 05c4140424a..00000000000
--- a/src/pkg/debug/macho/testdata/hello.b
+++ /dev/null
@@ -1,7 +0,0 @@
-main( ) {
-	extrn a, b, c;
-	putchar(a); putchar(b); putchar(c); putchar('!*n');
-}
-a 'hell';
-b 'o, w';
-c 'orld';
diff --git a/src/pkg/debug/macho/testdata/hello.c b/src/pkg/debug/macho/testdata/hello.c
new file mode 100644
index 00000000000..2264d04fbe8
--- /dev/null
+++ b/src/pkg/debug/macho/testdata/hello.c
@@ -0,0 +1,3 @@
+main() {
+	printf("hello, world");
+}