Index: src/runtime/Makefile
==================================================================
--- src/runtime/Makefile
+++ src/runtime/Makefile
@@ -31,11 +31,12 @@
        static-instances.m	\
        synchronized.m		\
        ${USE_SRCS_THREADS}
 SRCS_THREADS = threading.m	\
 	       ../mutex.m	\
-	       ../once.m
+	       ../once.m	\
+	       ../tlskey.m
 INCLUDES = ObjFWRT.h
 includesubdir = ObjFWRT
 
 OBJS_EXTRA = ${LOOKUP_ASM_LOOKUP_ASM_A}
 LIB_OBJS_EXTRA = ${LOOKUP_ASM_LOOKUP_ASM_LIB_A}