diff --git a/lib/zig.h b/lib/zig.h
index ed615e9e7210bd9fc249011f1820ed1f822ca048..8f68ba916b0218c18b77247473f36b4878aa1da2 100644
--- a/lib/zig.h
+++ b/lib/zig.h
@@ -11,8 +11,6 @@
 #elif defined(__GNUC__)
 #define zig_gcc
 #define zig_gnuc
-#elif defined(__IBMC__)
-#define zig_xlc
 #elif defined(__TINYC__)
 #define zig_tinyc
 #elif defined(__slimcc__)