diff --git a/ports/lcms/cpp17.patch b/ports/lcms/cpp17.patch
new file mode 100644
index 00000000000..77da5bef17a
--- /dev/null
+++ b/ports/lcms/cpp17.patch
@@ -0,0 +1,13 @@
+diff --git a/include/lcms2.h b/include/lcms2.h
+index 7e061ce7c..5d234c4e4 100644
+--- a/include/lcms2.h
++++ b/include/lcms2.h
+@@ -152,7 +152,7 @@ typedef double               cmsFloat64Number;
+ #endif
+ 
+ // Handle "register" keyword
+-#if defined(CMS_NO_REGISTER_KEYWORD) && !defined(CMS_DLL) && !defined(CMS_DLL_BUILD) 
++#if __cplusplus >= 201703L || defined(CMS_NO_REGISTER_KEYWORD) && !defined(CMS_DLL) && !defined(CMS_DLL_BUILD) 
+ #  define CMSREGISTER
+ #else
+ #  define CMSREGISTER register
diff --git a/ports/lcms/portfile.cmake b/ports/lcms/portfile.cmake
index 78b8409ce0d..1facfa22df9 100644
--- a/ports/lcms/portfile.cmake
+++ b/ports/lcms/portfile.cmake
@@ -11,6 +11,7 @@ vcpkg_from_github(
     PATCHES
         remove_library_directive.patch
         ${ADDITIONAL_PATCH}
+        cpp17.patch
 )
 
 file(COPY "${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt" DESTINATION "${SOURCE_PATH}")
diff --git a/ports/lcms/vcpkg.json b/ports/lcms/vcpkg.json
index 8a78ac8bbf2..718a2b5c2b7 100644
--- a/ports/lcms/vcpkg.json
+++ b/ports/lcms/vcpkg.json
@@ -1,7 +1,7 @@
 {
   "name": "lcms",
   "version": "2.12",
-  "port-version": 3,
+  "port-version": 4,
   "description": "Little CMS.",
   "homepage": "https://github.com/mm2/Little-CMS",
   "dependencies": [
diff --git a/versions/baseline.json b/versions/baseline.json
index 14223112e87..df4ec19326c 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -3414,7 +3414,7 @@
     },
     "lcms": {
       "baseline": "2.12",
-      "port-version": 3
+      "port-version": 4
     },
     "leaf": {
       "baseline": "0.2.2",
diff --git a/versions/l-/lcms.json b/versions/l-/lcms.json
index 5253e422477..65c76959c12 100644
--- a/versions/l-/lcms.json
+++ b/versions/l-/lcms.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "220d2255b3f13ec7b0266393d65c674f5c060c2b",
+      "version": "2.12",
+      "port-version": 4
+    },
     {
       "git-tree": "5e1b890660ea5d2a869407a0714d4385e949b4d6",
       "version": "2.12",