diff --git a/mail/opensmtpd/Portfile b/mail/opensmtpd/Portfile
index a71340b3dd238..f845509ad7744 100644
--- a/mail/opensmtpd/Portfile
+++ b/mail/opensmtpd/Portfile
@@ -44,7 +44,8 @@ post-patch {
 }
 
 #temp fix for 7.4.0p1. Already patched upstream, to be included in next release.
-patchfiles          configure.patch
+patchfiles          configure.patch \
+                    EAI_OVERFLOW.patch
  
 depends_build-append \
                     port:autoconf \
diff --git a/mail/opensmtpd/files/EAI_OVERFLOW.patch b/mail/opensmtpd/files/EAI_OVERFLOW.patch
new file mode 100644
index 0000000000000..128d6badf97a7
--- /dev/null
+++ b/mail/opensmtpd/files/EAI_OVERFLOW.patch
@@ -0,0 +1,15 @@
+https://github.com/OpenSMTPD/OpenSMTPD/pull/1247
+
+--- openbsd-compat/defines.h	2023-09-29 20:59:00
++++ openbsd-compat/defines.h	2024-03-06 20:18:17
+@@ -456,6 +456,10 @@
+ # endif
+ #endif
+ /* end of chl */
++
++#ifndef EAI_OVERFLOW
++#define EAI_OVERFLOW EAI_FAIL
++#endif
+ 
+ #ifndef HAVE_FPARSELN
+ /*