diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index fdc8966e9..cd80da60e 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -1470,6 +1470,9 @@ decompose_indic (const hb_ot_shape_normalize_context_t *c,
   {
     /* Don't decompose these. */
     case 0x0931u  : return false; /* DEVANAGARI LETTER RRA */
+    // https://github.com/harfbuzz/harfbuzz/issues/779
+    case 0x09DCu  : return false; /* BENGALI LETTER RRA */
+    case 0x09DDu  : return false; /* BENGALI LETTER RHA */
     case 0x0B94u  : return false; /* TAMIL LETTER AU */
 
 
diff --git a/test/shaping/data/in-house/Makefile.sources b/test/shaping/data/in-house/Makefile.sources
index 1922fd4cd..9a1434ec6 100644
--- a/test/shaping/data/in-house/Makefile.sources
+++ b/test/shaping/data/in-house/Makefile.sources
@@ -16,6 +16,7 @@ TESTS = \
 	tests/hangul-jamo.tests \
 	tests/hyphens.tests \
 	tests/indic-consonant-with-stacker.tests \
+	tests/indic-decompose.tests \
 	tests/indic-init.tests \
 	tests/indic-joiner-candrabindu.tests \
 	tests/indic-joiners.tests \
diff --git a/test/shaping/data/in-house/fonts/932ad5132c2761297c74e9976fe25b08e5ffa10b.ttf b/test/shaping/data/in-house/fonts/932ad5132c2761297c74e9976fe25b08e5ffa10b.ttf
new file mode 100644
index 000000000..ef20bf804
Binary files /dev/null and b/test/shaping/data/in-house/fonts/932ad5132c2761297c74e9976fe25b08e5ffa10b.ttf differ
diff --git a/test/shaping/data/in-house/tests/indic-decompose.tests b/test/shaping/data/in-house/tests/indic-decompose.tests
new file mode 100644
index 000000000..ca887bea6
--- /dev/null
+++ b/test/shaping/data/in-house/tests/indic-decompose.tests
@@ -0,0 +1 @@
+../fonts/932ad5132c2761297c74e9976fe25b08e5ffa10b.ttf:--font-funcs=ot:U+09DC,U+0020,U+09DD,U+0020,U+09A1,U+09BC,U+0020,U+09A2,U+09BC:[bn_rha=0+1024|space=1+1024|bn_yya=2+1024|space=3+1024|bn_dda=4+1024|bn_nukta=4+1024|space=6+1024|bn_ddha=7+1024|bn_nukta=7+1024]