diff --git a/mm/umm_heap/Make.defs b/mm/umm_heap/Make.defs
index e9e20adbb85..c992160c385 100644
--- a/mm/umm_heap/Make.defs
+++ b/mm/umm_heap/Make.defs
@@ -20,7 +20,7 @@
 
 # User heap allocator
 
-CSRCS += umm_globals.c umm_initialize.c umm_addregion.c mm_malloc_size.c
+CSRCS += umm_globals.c umm_initialize.c umm_addregion.c umm_malloc_size.c
 CSRCS += umm_brkaddr.c umm_calloc.c umm_extend.c umm_free.c umm_mallinfo.c
 CSRCS += umm_malloc.c umm_memalign.c umm_realloc.c umm_zalloc.c umm_heapmember.c