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-rw-r--r--src/makefile.osx2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/makefile.osx b/src/makefile.osx
index 227756f274..9728733122 100644
--- a/src/makefile.osx
+++ b/src/makefile.osx
@@ -53,7 +53,7 @@ LIBS += \
TESTDEFS += -DBOOST_TEST_DYN_LINK
endif
-DEFS=-DMAC_OSX -DMSG_NOSIGNAL=0 -DUSE_IPV6
+DEFS=-DMAC_OSX -DMSG_NOSIGNAL=0 -DBOOST_SPIRIT_THREADSAFE -DUSE_IPV6
ifdef RELEASE
# Compile for maximum compatibility and smallest size.