diff --git a/src/per_curve/decaf.tmpl.c b/src/per_curve/decaf.tmpl.c
index edcbdfd..3bb2833 100644
--- a/src/per_curve/decaf.tmpl.c
+++ b/src/per_curve/decaf.tmpl.c
@@ -104,6 +104,15 @@ static mask_t gf_lobit(const gf x) {
 /** identity = (0,1) */
 const point_t API_NS(point_identity) = {{{{{0}}},{{{1}}},{{{1}}},{{{0}}}}};
 
+void API_NS(deisogenize) (
+    gf_s *__restrict__ s,
+    gf_s *__restrict__ minus_t_over_s,
+    const point_t p,
+    mask_t toggle_hibit_s,
+    mask_t toggle_hibit_t_over_s,
+    mask_t toggle_rotation
+);
+    
 void API_NS(deisogenize) (
     gf_s *__restrict__ s,
     gf_s *__restrict__ minus_t_over_s,