diff --git a/harbour/source/rtl/readvar.prg b/harbour/source/rtl/readvar.prg
index 131ef87d5e..ed84beebec 100644
--- a/harbour/source/rtl/readvar.prg
+++ b/harbour/source/rtl/readvar.prg
@@ -33,6 +33,8 @@
  *
  */
 
+#include "common.ch"
+
 FUNCTION ReadVar( cVarName )
    STATIC s_cVarName := ""