diff --git a/SCons/Tools/crossmingw.py b/SCons/Tools/crossmingw.py
index 106f4034..b628d8d6 100644
--- a/SCons/Tools/crossmingw.py
+++ b/SCons/Tools/crossmingw.py
@@ -43,7 +43,7 @@ import SCons.Tool
 import SCons.Util
 
 # This is what we search for to find mingw:
-prefixes = SCons.Util.Split("""
+prefixes32 = SCons.Util.Split("""
     mingw32-
     mingw32msvc-
     i386-mingw32-
@@ -64,10 +64,18 @@ prefixes = SCons.Util.Split("""
     i686-w64-mingw32-
 """)
 
+prefixes64 = SCons.Util.Split("""
+    x86_64-w64-mingw32-
+""")
+
 def find(env):
     # Explicitly specified toolchain to build Windows executables
     # takes predominance.
     prefix = SCons.Script.ARGUMENTS.get('XGCC_W32_PREFIX', None)
+    prefixes = prefixes32
+    if env['TARGET_ARCH'] == 'amd64':
+        prefixes = prefixes64
+
     if prefix:
         prefixes.insert(0, prefix)
     for prefix in prefixes: