diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e99e5a51..2703a2c23 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -323,7 +323,7 @@ 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 -D_POSIX_C_SOURCE")
+    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)
diff --git a/src/common/stack_trace.cpp b/src/common/stack_trace.cpp
index 2805e7604..0d2ccb39d 100644
--- a/src/common/stack_trace.cpp
+++ b/src/common/stack_trace.cpp
@@ -33,7 +33,9 @@
 #include <libunwind.h>
 #endif
 #include <cxxabi.h>
+#ifndef STATICLIB
 #include <dlfcn.h>
+#endif
 
 // from http://stackoverflow.com/questions/11665829/how-can-i-print-stack-trace-for-caught-exceptions-in-c-code-injection-in-c
 #ifdef STATICLIB