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-rw-r--r--src/math/acos.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/math/acos.c b/src/math/acos.c
index b97100e8..456a2219 100644
--- a/src/math/acos.c
+++ b/src/math/acos.c
@@ -39,7 +39,7 @@ static const double
one = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */
pi = 3.14159265358979311600e+00, /* 0x400921FB, 0x54442D18 */
pio2_hi = 1.57079632679489655800e+00; /* 0x3FF921FB, 0x54442D18 */
-static volatile double
+static const volatile double
pio2_lo = 6.12323399573676603587e-17; /* 0x3C91A626, 0x33145C07 */
static const double
pS0 = 1.66666666666666657415e-01, /* 0x3FC55555, 0x55555555 */