diff --git a/CLI/Reduce.cpp b/CLI/Reduce.cpp
index 38133e04..721bb51c 100644
--- a/CLI/Reduce.cpp
+++ b/CLI/Reduce.cpp
@@ -15,7 +15,7 @@
 
 #define VERBOSE 0 // 1 - print out commandline invocations.  2 - print out stdout
 
-#ifdef _WIN32
+#if defined(_WIN32) && !defined(__MINGW32__)
 
 const auto popen = &_popen;
 const auto pclose = &_pclose;
diff --git a/VM/src/lmem.cpp b/VM/src/lmem.cpp
index 3cbdafff..25ca999d 100644
--- a/VM/src/lmem.cpp
+++ b/VM/src/lmem.cpp
@@ -98,6 +98,8 @@
  */
 #if defined(__APPLE__)
 #define ABISWITCH(x64, ms32, gcc32) (sizeof(void*) == 8 ? x64 : gcc32)
+#elif defined(__i386__) && defined(__MINGW32__) && !defined(__MINGW64__)
+#define ABISWITCH(x64, ms32, gcc32) (ms32)
 #elif defined(__i386__) && !defined(_MSC_VER)
 #define ABISWITCH(x64, ms32, gcc32) (gcc32)
 #else