diff --git a/man/fi_collective.3.md b/man/fi_collective.3.md
index fe7d7860773..f42c4faa564 100644
--- a/man/fi_collective.3.md
+++ b/man/fi_collective.3.md
@@ -493,7 +493,7 @@ For a description of struct fi_atomic_attr, see
 *datatype_attr.count*
 : The maximum number of elements that may be used with the collective.
 
-*datatype.size*
+*datatype_attr.size*
 : The size of the datatype as supported by the provider.  Applications
   should validate the size of datatypes that differ based on the platform,
   such as FI_LONG_DOUBLE.