diff --git a/SWIG/Source/Preprocessor/cpp.c b/SWIG/Source/Preprocessor/cpp.c
index 1bdb013a2..e72e6550b 100644
--- a/SWIG/Source/Preprocessor/cpp.c
+++ b/SWIG/Source/Preprocessor/cpp.c
@@ -1092,6 +1092,7 @@ Preprocessor_parse(DOH *s)
   	Putc(c,decl);
   	state = 110;
       } else {
+	Putc('%',chunk);
   	Putc(c,chunk);
   	state = 1;
       }