diff --git a/CMakeLists.txt b/CMakeLists.txt
index 43d03a879..f3b517a8b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -158,6 +158,8 @@ else()
     set(MINGW_FLAG "${MINGW_FLAG} -DWIN32_LEAN_AND_MEAN")
     set(Boost_THREADAPI win32)
     include_directories(SYSTEM src/platform/mingw)
+    # mingw doesn't support LTO (multiple definition errors at link time)
+    set(USE_LTO_DEFAULT false)
   endif()
   set(C_WARNINGS "-Waggregate-return -Wnested-externs -Wold-style-definition -Wstrict-prototypes")
   set(CXX_WARNINGS "-Wno-reorder -Wno-missing-field-initializers")