diff --git a/mono-6.12.0-fix-process-start.patch b/mono-6.12.0-fix-process-start.patch
new file mode 100644
index 0000000..4b9e02c
--- /dev/null
+++ b/mono-6.12.0-fix-process-start.patch
@@ -0,0 +1,42 @@
+From 325577feffad1f87b07d92710c0d37c79c5f50a1 Mon Sep 17 00:00:00 2001
+From: Ryan Lucia <rylucia@microsoft.com>
+Date: Thu, 4 Feb 2021 08:55:48 -0500
+Subject: [PATCH] Fix early return in Process.Start
+
+---
+ mono/metadata/w32process-unix.c | 7 +++++--
+ 1 file changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/mono/metadata/w32process-unix.c b/mono/metadata/w32process-unix.c
+index 663cc6ff5111..d030101aede6 100644
+--- a/mono/metadata/w32process-unix.c
++++ b/mono/metadata/w32process-unix.c
+@@ -2032,6 +2032,9 @@ ves_icall_System_Diagnostics_Process_ShellExecuteEx_internal (MonoW32ProcessStar
+ 
+ 		static char *handler;
+ 		static gunichar2 *handler_utf16;
++#ifndef HOST_DARWIN
++		gboolean finished = FALSE;
++#endif
+ 
+ 		if (handler_utf16 == (gunichar2 *)-1) {
+ 			ret = FALSE;
+@@ -2057,6 +2060,7 @@ ves_icall_System_Diagnostics_Process_ShellExecuteEx_internal (MonoW32ProcessStar
+ 				if (handler == NULL){
+ 					handler_utf16 = (gunichar2 *) -1;
+ 					ret = FALSE;
++					finished = TRUE;
+ 				} else {
+ 					/* kfmclient needs exec argument */
+ 					char *old = handler;
+@@ -2067,9 +2071,8 @@ ves_icall_System_Diagnostics_Process_ShellExecuteEx_internal (MonoW32ProcessStar
+ 			}
+ 		}
+ 		MONO_EXIT_GC_SAFE;
+-		if (ret == FALSE){
++		if (finished)
+ 			goto done;
+-		}
+ #endif
+ 		handler_utf16 = g_utf8_to_utf16 (handler, -1, NULL, NULL, NULL);
+ 		g_free (handler);