--- /dev/null
+#include "libm.h"
+
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+long double complex csinl(long double complex z)
+{
+ return csin(z);
+}
+#else
+long double complex csinl(long double complex z)
+{
+ z = csinhl(cpackl(-cimagl(z), creall(z)));
+ return cpackl(cimagl(z), -creall(z));
+}
+#endif