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-rw-r--r--benchtests/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/benchtests/Makefile b/benchtests/Makefile
index 67728537a8..680440f429 100644
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -102,7 +102,7 @@ ifndef BENCH_DURATION
 BENCH_DURATION := 10
 endif
 
-CPPFLAGS-nonlib = -DDURATION=$(BENCH_DURATION)
+CPPFLAGS-nonlib += -DDURATION=$(BENCH_DURATION)
 
 # Use clock_gettime to measure performance of functions.  The default is to use
 # HP_TIMING if it is available.