diff --git a/common.mak b/common.mak
index d6cb5f6aec..dc4133a9da 100644
--- a/common.mak
+++ b/common.mak
@@ -101,6 +101,7 @@ HEADERS   += $(HEADERS-yes)
 
 DEP_LIBS := $(foreach NAME,$(FFLIBS),lib$(NAME)/$($(CONFIG_SHARED:yes=S)LIBNAME))
 
+SRC_DIR    := $(SRC_PATH)/lib$(NAME)
 ALLHEADERS := $(subst $(SRC_DIR)/,$(SUBDIR),$(wildcard $(SRC_DIR)/*.h $(SRC_DIR)/$(ARCH)/*.h))
 SKIPHEADERS += $(ARCH_HEADERS:%=$(ARCH)/%) $(SKIPHEADERS-)
 SKIPHEADERS := $(SKIPHEADERS:%=$(SUBDIR)%)
diff --git a/library.mak b/library.mak
index e849cc2268..78c437edfa 100644
--- a/library.mak
+++ b/library.mak
@@ -1,5 +1,3 @@
-SRC_DIR := $(SRC_PATH)/lib$(NAME)
-
 include $(SRC_PATH)/common.mak
 
 LIBVERSION := $(lib$(NAME)_VERSION)