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-rw-r--r--sysdeps/libm-ieee754/s_catan.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/libm-ieee754/s_catan.c b/sysdeps/libm-ieee754/s_catan.c
index bab87e95a8..a3fc9ad3e8 100644
--- a/sysdeps/libm-ieee754/s_catan.c
+++ b/sysdeps/libm-ieee754/s_catan.c
@@ -69,7 +69,7 @@ __catan (__complex__ double x)
 
       den = 1 - r2 - __imag__ x * __imag__ x;
 
-      __real__ res = 0.5 * __atan ((2.0 * __real__ x) / den);
+      __real__ res = 0.5 * __ieee754_atan2 (2.0 * __real__ x, den);
 
       num = __imag__ x + 1.0;
       num = r2 + num * num;