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-rw-r--r--sysdeps/libm-ieee754/s_ctan.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_ctan.c b/sysdeps/libm-ieee754/s_ctan.c
index c68c3ad3e4..f1ce9688bb 100644
--- a/sysdeps/libm-ieee754/s_ctan.c
+++ b/sysdeps/libm-ieee754/s_ctan.c
@@ -19,6 +19,7 @@
    Boston, MA 02111-1307, USA.  */
 
 #include <complex.h>
+#include <fenv.h>
 #include <math.h>
 
 #include "math_private.h"
@@ -44,6 +45,11 @@ __ctan (__complex__ double x)
 	{
 	  __real__ res = __nan ("");
 	  __imag__ res = __nan ("");
+
+#ifdef FE_INVALID
+	  if (__isinf (__real__ x))
+	    feraiseexcept (FE_INVALID);
+#endif
 	}
     }
   else