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-rw-r--r--src/bin/pgbench/pgbench.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/bin/pgbench/pgbench.c b/src/bin/pgbench/pgbench.c
index 820b1ea09f5..18d9c94ebd3 100644
--- a/src/bin/pgbench/pgbench.c
+++ b/src/bin/pgbench/pgbench.c
@@ -68,6 +68,7 @@
#include "port/pg_bitutils.h"
#include "portability/instr_time.h"
+/* X/Open (XSI) requires <math.h> to provide M_PI, but core POSIX does not */
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif