diff --git a/tofu/geom/_vignetting_tools.pxd b/tofu/geom/_vignetting_tools.pxd
index 53e922654..f8cb758a2 100644
--- a/tofu/geom/_vignetting_tools.pxd
+++ b/tofu/geom/_vignetting_tools.pxd
@@ -94,7 +94,7 @@ cdef int triangulate_polys(double** vignett_poly,
                             int64_t* lnvert,
                             int nvign,
                             int64_t** ltri,
-                            int num_threads) nogil except -1
+                            int num_threads) except -1 nogil
 
 
 # ===============================================================
diff --git a/tofu/geom/_vignetting_tools.pyx b/tofu/geom/_vignetting_tools.pyx
index f954ec53c..d8f9c9f72 100644
--- a/tofu/geom/_vignetting_tools.pyx
+++ b/tofu/geom/_vignetting_tools.pyx
@@ -478,7 +478,7 @@ cdef inline int triangulate_polys(
     int nvign,
     int64_t** ltri,
     int num_threads,
-) nogil except -1:
+) except -1 nogil:
     """
     Triangulates a list 3d polygon using the earclipping techinque
     https://www.geometrictools.com/Documentation/TriangulationByEarClipping.pdf