Index: lld/MinGW/Driver.cpp
===================================================================
--- lld/MinGW/Driver.cpp
+++ lld/MinGW/Driver.cpp
@@ -219,10 +219,19 @@
     StringRef majSubSysVer = args.getLastArgValue(OPT_major_subsystem_version, "6");
     StringRef minSubSysVer = args.getLastArgValue(OPT_minor_subsystem_version, "0");
     StringRef subSys = args.getLastArgValue(OPT_subs, "default");
+    StringRef subSysName, subSysVer;
+    std::tie(subSysName, subSysVer) = subSys.split(':');
     add("-osversion:" + majOSVer + "." + minOSVer);
-    add("-subsystem:" + subSys + "," + majSubSysVer + "." + minSubSysVer);
-  } else if (auto *a = args.getLastArg(OPT_subs)) {
-    add("-subsystem:" + StringRef(a->getValue()));
+    if (subSysVer.empty())
+      add("-subsystem:" + subSysName + "," + majSubSysVer + "." + minSubSysVer);
+    else // The version from --subsystem takes precedence, if both are specified
+      add("-subsystem:" + subSysName + "," + subSysVer);
+  } else if (args.hasArg(OPT_subs)) {
+    StringRef subSys = args.getLastArgValue(OPT_subs, "default");
+    StringRef subSysName, subSysVer;
+    std::tie(subSysName, subSysVer) = subSys.split(':');
+    StringRef sep = subSysVer.empty() ? "" : ",";
+    add("-subsystem:" + subSysName + sep + subSysVer);
   }
 
   if (auto *a = args.getLastArg(OPT_out_implib))
Index: lld/test/MinGW/driver.test
===================================================================
--- lld/test/MinGW/driver.test
+++ lld/test/MinGW/driver.test
@@ -78,6 +78,9 @@
 SUBSYSTEM_DEFAULT_MINOR: -subsystem:default,7.0
 
 RUN: ld.lld -### foo.o -m i386pep --subsystem windows --major-subsystem-version 7 --minor-subsystem-version 8 | FileCheck -check-prefix=SUBSYSTEM_WINDOWS %s
+RUN: ld.lld -### foo.o -m i386pep --subsystem windows:7.8 | FileCheck -check-prefix=SUBSYSTEM_WINDOWS %s
+RUN: ld.lld -### foo.o -m i386pep --subsystem windows:7.8 --major-subsystem-version 2 --minor-subsystem-version 3 | FileCheck -check-prefix=SUBSYSTEM_WINDOWS %s
+RUN: ld.lld -### foo.o -m i386pep --subsystem windows:7.8 | FileCheck -check-prefix=SUBSYSTEM_WINDOWS %s
 SUBSYSTEM_WINDOWS: -subsystem:windows,7.8
 
 RUN: ld.lld -### foo.o -m i386pep -stack 4194304,8192 | FileCheck -check-prefix=STACK %s