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-rw-r--r--math/libm-test.inc3
1 files changed, 3 insertions, 0 deletions
diff --git a/math/libm-test.inc b/math/libm-test.inc
index 481c395643..2c3a3f6ffa 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -3975,6 +3975,9 @@ tanh_test (void)
   TEST_f_f (tanh, 1.0L, 0.7615941559557648881194582826047935904L);
   TEST_f_f (tanh, -1.0L, -0.7615941559557648881194582826047935904L);
 
+  /* 2^-56  */
+  TEST_f_f (tanh, 1.387778780781445675529539585113525390625e-17L, 1.387778780781445675529539585113525390625e-17L);
+  
   END (tanh);
 }