diff --git a/cypari2/paridecl.pxd b/cypari2/paridecl.pxd
index 29cb8ef8..9ccf3361 100644
--- a/cypari2/paridecl.pxd
+++ b/cypari2/paridecl.pxd
@@ -118,6 +118,7 @@ cdef extern from *:     # PARI headers already included by types.pxd
     extern PariOUT* pariOut
     extern PariOUT* pariErr
     extern byteptr diffptr
+    extern pari_prime* pari_PRIMES
 
     ###############################################
     #                                             #
diff --git a/cypari2/types.pxd b/cypari2/types.pxd
index 9ee4fe67..7f00b52e 100644
--- a/cypari2/types.pxd
+++ b/cypari2/types.pxd
@@ -24,6 +24,7 @@ cdef extern from "pari/pari.h":
     ctypedef long* GEN
     ctypedef char* byteptr
     ctypedef unsigned long pari_sp
+    ctypedef unsigned long pari_prime
 
     # PARI types
     enum: