diff --git a/src/Makefile.inc b/src/Makefile.inc
index 2e4c8c500..ff846cdfa 100644
--- a/src/Makefile.inc
+++ b/src/Makefile.inc
@@ -11,6 +11,7 @@ SRC_FILES = \
     btstack_memory_pool.c \
     btstack_ring_buffer.c \
     btstack_run_loop.c \
+    btstack_run_loop_base.c \
     btstack_slip.c \
     btstack_tlv.c \
     btstack_util.c \