diff --git a/lib/Sema/SemaChecking.cpp b/lib/Sema/SemaChecking.cpp
index c4183a0..4856e7f 100644
--- a/lib/Sema/SemaChecking.cpp
+++ b/lib/Sema/SemaChecking.cpp
@@ -1062,6 +1062,11 @@
       CurrentState = state_OrdChr;
       break;
 
+    case 'm':
+      // FIXME: Warn in situations where this isn't supported!
+      CurrentState = state_OrdChr;
+      break;
+
     // CHECK: Are we using "%n"?  Issue a warning.
     case 'n': {
       ++numConversions;