diff --git a/util/ass/ass50.c b/util/ass/ass50.c
index 6b3663dcf..111b6dda3 100644
--- a/util/ass/ass50.c
+++ b/util/ass/ass50.c
@@ -66,7 +66,7 @@ pass_5() {
 #ifdef JOHAN
 		if ( jflag ) {
 			extern char em_mnem[][4] ;
-			printf("%s %D\n",em_mnem[ope],off1) ;
+			printf("%s %ld\n",em_mnem[ope],off1) ;
 		}
 #endif
 
diff --git a/util/ass/ass60.c b/util/ass/ass60.c
index 2a6e1c154..a02efcd25 100644
--- a/util/ass/ass60.c
+++ b/util/ass/ass60.c
@@ -87,7 +87,7 @@ dump(n)
 	if (d_flag==0) return;
 if ( (n==0 && d_flag) || (n==4 && d_flag>=2) || (n<100 && d_flag>=3) ) {
 	printf("\nEM1-assembler      *****   pass %1d complete:\n",n);
-	printf("current size %D\n",prog_size) ;
+	printf("current size %ld\n",prog_size) ;
 	printf("  %9.9s%9.9s%14.14s%8.8s%8.8s\n", "instr_nr",
 		"type1","addr1","length","format");
 	for (ln = pstate.s_fline ; ln ;