diff --git a/common/params_pyx.pyx b/common/params_pyx.pyx
index cc6bd287a6..de52c490b3 100644
--- a/common/params_pyx.pyx
+++ b/common/params_pyx.pyx
@@ -14,7 +14,7 @@ cdef extern from "common/params.h":
     ALL
 
   cdef cppclass c_Params "Params":
-    c_Params(string) nogil except +
+    c_Params(string) except + nogil
     string get(string, bool) nogil
     bool getBool(string, bool) nogil
     int remove(string) nogil