diff --git a/lang/tcl/Makefile b/lang/tcl/Makefile
index 86f09ec92..98fa16571 100644
--- a/lang/tcl/Makefile
+++ b/lang/tcl/Makefile
@@ -25,6 +25,7 @@ include $(INCLUDE_DIR)/package.mk
 define Package/tcl
   SECTION:=lang
   CATEGORY:=Languages
+  DEPENDS:=+libpthread
   TITLE:=TCL Lang
   URL:=http://www.tcl.tk
 endef