diff --git a/cmd/Makefile.am b/cmd/Makefile.am
index 6d6de4adb4..2bd9d039f2 100644
--- a/cmd/Makefile.am
+++ b/cmd/Makefile.am
@@ -39,8 +39,6 @@ zhack_LDADD = \
 
 
 ztest_CFLAGS    = $(AM_CFLAGS) $(KERNEL_CFLAGS)
-# Get rid of compiler warning for unchecked truncating snprintfs on gcc 7.1.1
-ztest_CFLAGS   += $(NO_FORMAT_TRUNCATION)
 ztest_CPPFLAGS  = $(AM_CPPFLAGS) $(FORCEDEBUG_CPPFLAGS)
 
 sbin_PROGRAMS   += ztest
diff --git a/config/Rules.am b/config/Rules.am
index 2e463ae608..30c5f353cd 100644
--- a/config/Rules.am
+++ b/config/Rules.am
@@ -21,7 +21,9 @@ AM_CFLAGS += $(IMPLICIT_FALLTHROUGH)
 AM_CFLAGS += $(DEBUG_CFLAGS)
 AM_CFLAGS += $(ASAN_CFLAGS)
 AM_CFLAGS += $(UBSAN_CFLAGS)
-AM_CFLAGS += $(CODE_COVERAGE_CFLAGS) $(NO_FORMAT_ZERO_LENGTH)
+AM_CFLAGS += $(CODE_COVERAGE_CFLAGS)
+AM_CFLAGS += $(NO_FORMAT_ZERO_LENGTH)
+AM_CFLAGS += $(NO_FORMAT_TRUNCATION)
 if BUILD_FREEBSD
 AM_CFLAGS += -fPIC -Werror -Wno-unknown-pragmas -Wno-enum-conversion
 AM_CFLAGS += -include $(top_srcdir)/include/os/freebsd/spl/sys/ccompile.h