diff --git a/gdb/python/python-value.c b/gdb/python/python-value.c
index 8bf4ec8..c17fb3b 100644
--- a/gdb/python/python-value.c
+++ b/gdb/python/python-value.c
@@ -30,7 +30,7 @@
    can copy the values' types if needed.  This is declared
    unconditionally to reduce the number of uses of HAVE_PYTHON in the
    generic code.  */
-struct value *values_in_python;
+struct value *values_in_python = NULL;
 
 #ifdef HAVE_PYTHON