diff --git a/common/configure.ac b/common/configure.ac
index d590e05..c07b7fd 100644
--- a/common/configure.ac
+++ b/common/configure.ac
@@ -28,6 +28,7 @@
 case "$host_os" in
     mingw*)
         CPPFLAGS="$CPPFLAGS -DWINVER=0x0500 -D_WIN32_IE=0x0500"
+        CXXFLAGS="$CXXFLAGS -mthreads"
         ;;
 esac
 
diff --git a/win/configure.ac b/win/configure.ac
index b3c4e47..256d69a 100644
--- a/win/configure.ac
+++ b/win/configure.ac
@@ -21,6 +21,7 @@
 fi
 
 CPPFLAGS="$CPPFLAGS -DWINVER=0x0500 -D_WIN32_IE=0x0500"
+CXXFLAGS="$CXXFLAGS -mthreads"
 
 AC_PATH_XTRA