diff --git a/ports/libb2/portfile.cmake b/ports/libb2/portfile.cmake
index 992c59f4be..fe26199ce7 100644
--- a/ports/libb2/portfile.cmake
+++ b/ports/libb2/portfile.cmake
@@ -16,7 +16,9 @@ endif()
 vcpkg_configure_make(
     AUTOCONFIG
     SOURCE_PATH ${SOURCE_PATH}
-    OPTIONS ${OPTIONS}
+    OPTIONS
+        ax_cv_check_cflags___O3=no # see https://github.com/microsoft/vcpkg/pull/17912#issuecomment-840514179
+        ${OPTIONS}
 )
 vcpkg_install_make()
 vcpkg_fixup_pkgconfig()
diff --git a/ports/libb2/vcpkg.json b/ports/libb2/vcpkg.json
index dbe8dc265e..6cd8bc6dc8 100644
--- a/ports/libb2/vcpkg.json
+++ b/ports/libb2/vcpkg.json
@@ -1,7 +1,7 @@
 {
   "name": "libb2",
-  "version-string": "0.98.1",
-  "port-version": 4,
+  "version": "0.98.1",
+  "port-version": 5,
   "description": "C library providing BLAKE2b, BLAKE2s, BLAKE2bp, BLAKE2sp",
   "homepage": "https://github.com/BLAKE2/libb2",
   "supports": "!windows"
diff --git a/versions/baseline.json b/versions/baseline.json
index b19db1d340..7145894ab0 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -2986,7 +2986,7 @@
     },
     "libb2": {
       "baseline": "0.98.1",
-      "port-version": 4
+      "port-version": 5
     },
     "libbacktrace": {
       "baseline": "2021-03-14",
diff --git a/versions/l-/libb2.json b/versions/l-/libb2.json
index 3543516134..084a1ee4c8 100644
--- a/versions/l-/libb2.json
+++ b/versions/l-/libb2.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "0419d2f293a094dc4cdca1111daea2a6425a137b",
+      "version": "0.98.1",
+      "port-version": 5
+    },
     {
       "git-tree": "98925560fbceb14da7820146f6df113f9dae7988",
       "version-string": "0.98.1",