diff --git a/modules/src/read_em/read_em.c b/modules/src/read_em/read_em.c
index a28b214e5..8eed3437d 100644
--- a/modules/src/read_em/read_em.c
+++ b/modules/src/read_em/read_em.c
@@ -266,9 +266,10 @@ EM_getinstr(p)
 				check(p->em_cst >= 0);
 				break;
 			case PAR_G:
-				if (p->em_argtype == cst_ptyp) {
-					check(p->em_cst >= 0);
+				if (p->em_argtype != cst_ptyp) {
+					break;
 				}
+				check(p->em_cst >= 0);
 				/* Fall through */
 			case PAR_F:
 				/* ??? not in original em_decode or em_encode */