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-rw-r--r--Makefile.am2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile.am b/Makefile.am
index 873883e..465a28d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,7 +23,7 @@ AM_LIBTOOLFLAGS = --silent
MAKEFLAGS = --no-print-directory
DECODERS_DIR = $(pkgdatadir)/decoders
-AM_CPPFLAGS = -D_DEFAULT_SOURCE -DDECODERS_DIR='"$(DECODERS_DIR)"'
+AM_CPPFLAGS = -D_POSIX_C_SOURCE=200112L -DDECODERS_DIR='"$(DECODERS_DIR)"'
# The tests CFLAGS are a superset of the libsigrokdecode CFLAGS.
AM_CFLAGS = $(SRD_EXTRA_CFLAGS) $(SRD_WFLAGS) $(TESTS_CFLAGS)