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-rw-r--r--src/ml_cairo_matrix.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ml_cairo_matrix.c b/src/ml_cairo_matrix.c
index 97ed2f2..17ecff5 100644
--- a/src/ml_cairo_matrix.c
+++ b/src/ml_cairo_matrix.c
@@ -21,7 +21,7 @@ ml_convert_cairo_matrix_in (value v, cairo_matrix_t *mat)
}
value
-ml_convert_cairo_matrix_out (cairo_matrix_t *mat)
+ml_convert_cairo_matrix_out (const cairo_matrix_t *mat)
{
value v;
v = caml_alloc_small (6 * Double_wosize, Double_array_tag);