diff --git a/usr.bin/factor/factor.c b/usr.bin/factor/factor.c
--- a/usr.bin/factor/factor.c
+++ b/usr.bin/factor/factor.c
@@ -82,7 +82,15 @@
 
 #include <openssl/bn.h>
 
-#define	PRIME_CHECKS	5
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+static inline int
+BN_check_prime(BN *p, BN_CTX *ctx, BN_GENCB *cb)
+{
+	const int nchecks = 5;
+
+	return BN_is_prime_ex(val, nchecks, ctx, cb);
+}
+#endif
 
 static void	pollard_pminus1(BIGNUM *); /* print factors for big numbers */
 
@@ -209,11 +217,7 @@
 			if (!BN_sqr(bnfact, bnfact, ctx))
 				errx(1, "error in BN_sqr()");
 			if (BN_cmp(bnfact, val) > 0 ||
-#if OPENSSL_VERSION_NUMBER >= 0x30000000L
 			    BN_check_prime(val, NULL, NULL) == 1)
-#else
-			    BN_is_prime_ex(val, PRIME_CHECKS, NULL, NULL) == 1)
-#endif
 				pr_print(val);
 			else
 				pollard_pminus1(val);
@@ -286,11 +290,7 @@
 			errx(1, "error in BN_gcd()");
 
 		if (!BN_is_one(x)) {
-#if OPENSSL_VERSION_NUMBER >= 0x30000000L
 			if (BN_check_prime(x, NULL, NULL) == 1)
-#else
-			if (BN_is_prime_ex(x, PRIME_CHECKS, NULL, NULL) == 1)
-#endif
 				pr_print(x);
 			else
 				pollard_pminus1(x);
@@ -299,13 +299,7 @@
 			BN_div(num, NULL, val, x, ctx);
 			if (BN_is_one(num))
 				return;
-#if OPENSSL_VERSION_NUMBER >= 0x30000000L
-			if (BN_check_prime(num, NULL, NULL) == 1)
-#else
-			if (BN_is_prime_ex(num, PRIME_CHECKS, NULL, NULL)
-			    == 1)
-#endif
-			{
+			if (BN_check_prime(num, NULL, NULL) == 1) {
 				pr_print(num);
 				fflush(stdout);
 				return;