diff --git a/modules/io/tests/test_mmcif_writer.cc b/modules/io/tests/test_mmcif_writer.cc
index ec1559d21f154d4c8dc68ed439fde47f07a5db6a..6ac8587c608682cbfe37a5e0c33aa525bed8db6b 100644
--- a/modules/io/tests/test_mmcif_writer.cc
+++ b/modules/io/tests/test_mmcif_writer.cc
@@ -324,7 +324,7 @@ BOOST_AUTO_TEST_CASE(mmcif_writer_small_sugars)
 {
   BOOST_TEST_MESSAGE("  Running mmcif_writer_small_sugars tests...");
   /*
-    While RCSB marks dipeptides and dinucleotides as non-ploymers, sugarse are
+    While RCSB marks dipeptides and dinucleotides as non-ploymers, sugars are
     marked branched as soon as there are 2 connected.
    */
   // Branched: 2 sugars connected (check RCSB 3AXH)