diff --git a/project/common.mk b/project/common.mk
index 75226a9..45c3178 100644
--- a/project/common.mk
+++ b/project/common.mk
@@ -1,10 +1,9 @@
-COMMON_SRCS = \
+API_SRCS = \
 	src/driver/amgc_amain.c \
 	src/driver/amgc_driver_ctx.c \
 	src/driver/amgc_paradigm_meta.c \
 	src/driver/amgc_unit_action.c \
 	src/driver/amgc_unit_ctx.c \
-	src/internal/apimagic_errinfo_impl.c \
 	src/logic/amgc_enum_members.c \
 	src/logic/amgc_init_unit_meta.c \
 	src/logic/amgc_map_input.c \
@@ -17,5 +16,10 @@ COMMON_SRCS = \
 	src/output/amgc_output_typedef.c \
 	src/skin/amgc_skin_default.c \
 
+INTERNAL_SRCS = \
+	src/internal/$(PACKAGE)_errinfo_impl.c \
+
 APP_SRCS = \
 	src/apimagic.c
+
+COMMON_SRCS = $(API_SRCS) $(INTERNAL_SRCS)