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-rw-r--r--src/stdlib/integers.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/stdlib/integers.h b/src/stdlib/integers.h
index c7643a8d..7b7cf12e 100644
--- a/src/stdlib/integers.h
+++ b/src/stdlib/integers.h
@@ -144,7 +144,7 @@ bool Int$is_prime(Int_t x, Int_t reps);
Int_t Int$next_prime(Int_t x);
#if __GNU_MP_VERSION >= 6
#if __GNU_MP_VERSION_MINOR >= 3
-Int_t Int$prev_prime(Int_t x);
+OptionalInt_t Int$prev_prime(Int_t x);
#endif
#endif
Int_t Int$choose(Int_t n, Int_t k);