diff --git a/src/mathed/Makefile.am b/src/mathed/Makefile.am
index 998fa6c42e..0f0efffca6 100644
--- a/src/mathed/Makefile.am
+++ b/src/mathed/Makefile.am
@@ -78,8 +78,6 @@ libmathed_la_SOURCES = \
 	math_gridinset.h \
 	math_hullinset.C \
 	math_hullinset.h \
-	math_inferinset.C \
-	math_inferinset.h \
 	math_inset.C \
 	math_inset.h \
 	math_iterator.C \