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-rw-r--r--CMakeLists.txt2
1 files changed, 1 insertions, 1 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d821cd88c..cb23beb5a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -322,7 +322,7 @@ else()
endif()
if(MINGW)
set(WARNINGS "${WARNINGS} -Wno-error=unused-value -Wno-error=unused-but-set-variable")
- set(MINGW_FLAG "${MINGW_FLAG} -DWIN32_LEAN_AND_MEAN")
+ set(MINGW_FLAG "${MINGW_FLAG} -DWIN32_LEAN_AND_MEAN -D_POSIX_C_SOURCE")
set(Boost_THREADAPI win32)
include_directories(SYSTEM src/platform/mingw)
# mingw doesn't support LTO (multiple definition errors at link time)