diff --git a/mkspecs/freebsd-clang/qmake.conf b/mkspecs/freebsd-clang/qmake.conf
index 7f18bbb721..0d6401f2f5 100644
--- a/mkspecs/freebsd-clang/qmake.conf
+++ b/mkspecs/freebsd-clang/qmake.conf
@@ -7,7 +7,7 @@ QMAKE_PLATFORM          = freebsd bsd
 
 include(../common/unix.conf)
 
-QMAKE_CFLAGS_THREAD     = -pthread -D_THREAD_SAFE
+QMAKE_CFLAGS_THREAD     = -pthread
 
 QMAKE_CXXFLAGS_THREAD   = $$QMAKE_CFLAGS_THREAD
 
diff --git a/mkspecs/freebsd-g++/qmake.conf b/mkspecs/freebsd-g++/qmake.conf
index 282b6bdfa7..56529389f6 100644
--- a/mkspecs/freebsd-g++/qmake.conf
+++ b/mkspecs/freebsd-g++/qmake.conf
@@ -7,7 +7,7 @@ QMAKE_PLATFORM          = freebsd bsd
 
 include(../common/unix.conf)
 
-QMAKE_CFLAGS_THREAD     = -pthread -D_THREAD_SAFE
+QMAKE_CFLAGS_THREAD     = -pthread
 
 QMAKE_CXXFLAGS_THREAD   = $$QMAKE_CFLAGS_THREAD