diff --git a/Makefile b/Makefile
index 5d83efc..06d714a 100644
--- a/Makefile
+++ b/Makefile
@@ -64,13 +64,13 @@ ${LIBUCONTEXT_POSIX_NAME}: ${LIBUCONTEXT_NAME} ${LIBUCONTEXT_POSIX_OBJ}
 	$(CC) -fPIC -o ${LIBUCONTEXT_POSIX_NAME} -Wl,-soname,${LIBUCONTEXT_POSIX_SONAME} \
 		-shared ${LIBUCONTEXT_POSIX_OBJ} ${LDFLAGS}
 
-${LIBUCONTEXT_POSIX_STATIC_NAME}: ${LIBUCONTEXT_POSIX_OBJ}
+${LIBUCONTEXT_POSIX_STATIC_NAME}: ${LIBUCONTEXT_STATIC_NAME} ${LIBUCONTEXT_POSIX_OBJ}
 	$(AR) rcs ${LIBUCONTEXT_POSIX_STATIC_NAME} ${LIBUCONTEXT_POSIX_OBJ}
 
 ${LIBUCONTEXT_POSIX_SONAME}: ${LIBUCONTEXT_POSIX_NAME}
 	ln -sf ${LIBUCONTEXT_POSIX_NAME} ${LIBUCONTEXT_POSIX_SONAME}
 
-${LIBUCONTEXT_STATIC_NAME}: ${LIBUCONTEXT_OBJ}
+${LIBUCONTEXT_STATIC_NAME}: ${LIBUCONTEXT_HEADERS} ${LIBUCONTEXT_OBJ}
 	$(AR) rcs ${LIBUCONTEXT_STATIC_NAME} ${LIBUCONTEXT_OBJ}
 
 ${LIBUCONTEXT_NAME}: ${LIBUCONTEXT_HEADERS} ${LIBUCONTEXT_OBJ}