diff --git a/src/pattern.c b/src/pattern.c
index 5817f7e..4b20a54 100644
--- a/src/pattern.c
+++ b/src/pattern.c
@@ -887,6 +887,9 @@
 			}
 			else
 				continue;
+		} else {
+		  /* impossible */
+		  continue;
 		}
 
 		/* Check if the input sample match the current pattern. */