diff --git a/Makefile b/Makefile
index c188b89..4bbad99 100644
--- a/Makefile
+++ b/Makefile
@@ -39,3 +39,9 @@ util.o: util.c util.h
 rad50.o: rad50.c rad50.h
 dumpobj.o: dumpobj.c rad50.h util.h
 rad50.o: rad50.c rad50.h
+
+# Since the only test we have so far is for a crash bug,
+# just try to assemble. Later, we will need expected/actual tests.
+tests: macro11
+	./macro11 tests/*
+
diff --git a/assemble.c b/assemble.c
index a6dfb88..67f0052 100644
--- a/assemble.c
+++ b/assemble.c
@@ -551,6 +551,8 @@ static int assemble(
                                 my_searchenv(macfile, "MCALL", hitfile, sizeof(hitfile));
                                 if (hitfile[0])
                                     macstr = new_file_stream(hitfile);
+                                else
+                                    macstr = NULL;
                             }
 
                             if (macstr != NULL) {