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-rw-r--r--src/unit.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/unit.c b/src/unit.c
index f7c0277..0a906fe 100644
--- a/src/unit.c
+++ b/src/unit.c
@@ -141,7 +141,7 @@ unit_convert_from(Unit *unit, const MPNumber *x, MPNumber *z)
{
g_return_val_if_fail(unit != NULL, FALSE);
g_return_val_if_fail(x != NULL, FALSE);
- g_return_val_if_fail(x != NULL, FALSE);
+ g_return_val_if_fail(z != NULL, FALSE);
if (unit->priv->from_function)
return solve_function(unit->priv->from_function, x, z);