diff --git a/src/ec_point.c b/src/ec_point.c
index 58fa293..e88f2f0 100644
--- a/src/ec_point.c
+++ b/src/ec_point.c
@@ -384,7 +384,7 @@ serialize_extensible (
     field_mul ( L0, L2, L1 );
 }
 
-void
+static void
 decaf_make_even (
     field_a_t a
 ) {