diff --git a/depends/hosts/mingw32.mk b/depends/hosts/mingw32.mk
index 1a65bd346..c80d14184 100644
--- a/depends/hosts/mingw32.mk
+++ b/depends/hosts/mingw32.mk
@@ -1,6 +1,6 @@
 mingw32_CC=x86_64-w64-mingw32-gcc-posix
 mingw32_CXX=x86_64-w64-mingw32-g++-posix
-mingw32_CFLAGS=-pipe -std=c++11
+mingw32_CFLAGS=-pipe -std=c11
 mingw32_CXXFLAGS=$(mingw32_CFLAGS) -std=c++11
 
 mingw32_release_CFLAGS=-O3
diff --git a/src/sync.cpp b/src/sync.cpp
index 6f9ae5768..632c5562e 100644
--- a/src/sync.cpp
+++ b/src/sync.cpp
@@ -25,13 +25,7 @@
 #include <boost/foreach.hpp>
 #include <boost/thread.hpp>
 
-#ifdef _WIN32
-#include <windows.h>
-#include <dbghelp.h>
-#else
-#include <execinfo.h>
-#endif
-
+#include <execinfo.h> /* backtrace, backtrace_symbols_fd */
 #include <unistd.h> /* STDOUT_FILENO */