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-rw-r--r--libguile/vm-i-system.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libguile/vm-i-system.c b/libguile/vm-i-system.c
index 2399fa065..b8c18f077 100644
--- a/libguile/vm-i-system.c
+++ b/libguile/vm-i-system.c
@@ -310,6 +310,7 @@ VM_DEFINE_INSTRUCTION (25, variable_ref, "variable-ref", 0, 1, 1)
{
SCM var_name;
+ SYNC_ALL ();
/* Attempt to provide the variable name in the error message. */
var_name = scm_module_reverse_lookup (scm_current_module (), x);
vm_error_unbound (program, scm_is_true (var_name) ? var_name : x);