diff --git a/util/cpp/preprocess.c b/util/cpp/preprocess.c
index 6d2b2095d..7b00160a6 100644
--- a/util/cpp/preprocess.c
+++ b/util/cpp/preprocess.c
@@ -156,6 +156,7 @@ preprocess(fn)
 							++LineNumber;
 							lineno++;
 						}
+						else if (c == '\'') continue;
 					}
 				}
 				while (c != stopc);