diff --git a/mips-dis.c b/mips-dis.c
index 867ecf2..5b0b247 100644
--- a/mips-dis.c
+++ b/mips-dis.c
@@ -3302,7 +3302,7 @@
 #endif
 
   /* Set ISA, architecture, and cp0 register names as best we can.  */
-#if ! SYMTAB_AVAILABLE && 0
+#if !defined(SYMTAB_AVAILABLE) && 0
   /* This is running out on a target machine, not in a host tool.
      FIXME: Where does mips_target_info come from?  */
   target_processor = mips_target_info.processor;