diff --git a/src/cmd/5c/list.c b/src/cmd/5c/list.c
index ab0fae83c2..86a31ae7a9 100644
--- a/src/cmd/5c/list.c
+++ b/src/cmd/5c/list.c
@@ -169,7 +169,7 @@ Dconv(Fmt *fp)
 
 	case D_SHIFT:
 		v = a->offset;
-		op = "<<>>->@>" + (((v>>5) & 3) << 1);
+		op = &"<<>>->@>"[(((v>>5) & 3) << 1)];
 		if(v & (1<<4))
 			sprint(str, "R%d%c%cR%d", v&15, op[0], op[1], (v>>8)&15);
 		else
diff --git a/src/cmd/5g/list.c b/src/cmd/5g/list.c
index 9bc3a9a9a6..3105d5669e 100644
--- a/src/cmd/5g/list.c
+++ b/src/cmd/5g/list.c
@@ -119,7 +119,7 @@ Dconv(Fmt *fp)
 
 	case D_SHIFT:
 		v = a->offset;
-		op = "<<>>->@>" + (((v>>5) & 3) << 1);
+		op = &"<<>>->@>"[(((v>>5) & 3) << 1)];
 		if(v & (1<<4))
 			sprint(str, "R%d%c%cR%d", v&15, op[0], op[1], (v>>8)&15);
 		else
diff --git a/src/cmd/5l/list.c b/src/cmd/5l/list.c
index 7b623d78a5..89c1c63026 100644
--- a/src/cmd/5l/list.c
+++ b/src/cmd/5l/list.c
@@ -191,7 +191,7 @@ Dconv(Fmt *fp)
 
 	case D_SHIFT:
 		v = a->offset;
-		op = "<<>>->@>" + (((v>>5) & 3) << 1);
+		op = &"<<>>->@>"[(((v>>5) & 3) << 1)];
 		if(v & (1<<4))
 			snprint(str, sizeof str, "R%d%c%cR%d", v&15, op[0], op[1], (v>>8)&15);
 		else