diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index f8ff4acfa1d99d38a367084f5446762290c7f95a..6f14777ce7a094aa1aed92f15b84330fc9b7df17 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -179,6 +179,8 @@ _hb_ot_shape_complex_setup_masks_indic (hb_ot_map_t *map, hb_buffer_t *buffer, h
       buffer->info[i].indic_position() = consonant_position (buffer->info[i].codepoint);
       if (is_ra (buffer->info[i].codepoint))
 	buffer->info[i].indic_category() = OT_Ra;
+    } else if (buffer->info[i].indic_category() == OT_SM) {
+      buffer->info[i].indic_position() = POS_POST;
     } else if (buffer->info[i].codepoint == 0x200C)
       buffer->info[i].indic_category() = OT_ZWNJ;
     else if (buffer->info[i].codepoint == 0x200D)