diff --git a/ports/sleef/portfile.cmake b/ports/sleef/portfile.cmake
index 53835ba823..6c65e37253 100644
--- a/ports/sleef/portfile.cmake
+++ b/ports/sleef/portfile.cmake
@@ -9,6 +9,7 @@ vcpkg_from_github(
         exclude-testerutil.diff
         export-link-libs.diff
         sleefdft.pc.diff
+        seh-cpu-ext.diff
 )
 
 vcpkg_check_features(OUT_FEATURE_OPTIONS options
diff --git a/ports/sleef/seh-cpu-ext.diff b/ports/sleef/seh-cpu-ext.diff
new file mode 100644
index 0000000000..6cd8eaa3cb
--- /dev/null
+++ b/ports/sleef/seh-cpu-ext.diff
@@ -0,0 +1,26 @@
+diff --git a/src/libm/dispatcher.h b/src/libm/dispatcher.h
+index 41b69d9..4d395c3 100644
+--- a/src/libm/dispatcher.h
++++ b/src/libm/dispatcher.h
+@@ -27,6 +27,14 @@ NOEXPORT int Sleef_internal_cpuSupportsExt(void (*tryExt)(), int *cache) {
+   static int cache = -1;
+   if (cache != -1) return cache;
+ 
++#ifdef _MSC_VER
++  __try {
++    (*tryExt)();
++    cache = 1;
++  } __except(1) {
++    cache = 0;
++  }
++#else
+   void (*org);
+   org = signal(SIGILL, sighandler);
+ 
+@@ -38,5 +46,6 @@ NOEXPORT int Sleef_internal_cpuSupportsExt(void (*tryExt)(), int *cache) {
+   }
+ 
+   signal(SIGILL, org);
++#endif
+   return cache;
+ }
diff --git a/ports/sleef/vcpkg.json b/ports/sleef/vcpkg.json
index 3dbf9a7cc4..1d97c39768 100644
--- a/ports/sleef/vcpkg.json
+++ b/ports/sleef/vcpkg.json
@@ -1,6 +1,7 @@
 {
   "name": "sleef",
   "version": "3.9.0",
+  "port-version": 1,
   "description": "SIMD Library for Evaluating Elementary Functions, vectorized libm and DFT",
   "homepage": "https://sleef.org/",
   "license": "BSL-1.0",
diff --git a/versions/baseline.json b/versions/baseline.json
index 693c955aa4..a94e4e5ce7 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -9046,7 +9046,7 @@
     },
     "sleef": {
       "baseline": "3.9.0",
-      "port-version": 0
+      "port-version": 1
     },
     "sleepy-discord": {
       "baseline": "2025-02-08",
diff --git a/versions/s-/sleef.json b/versions/s-/sleef.json
index 63e959c8c3..0aa0f38047 100644
--- a/versions/s-/sleef.json
+++ b/versions/s-/sleef.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "c20095f0ab0040ddf9f28377e35d670fbc720daa",
+      "version": "3.9.0",
+      "port-version": 1
+    },
     {
       "git-tree": "afcb099ce882dcb1b316af9efa306b6d9ec3ba69",
       "version": "3.9.0",