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diff --git a/winsup/mingw/mingwex/complex/cprojf.c b/winsup/mingw/mingwex/complex/cprojf.c
new file mode 100755
index 0000000000..f1d2d730a8
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+++ b/winsup/mingw/mingwex/complex/cprojf.c
@@ -0,0 +1,22 @@
+/*
+   cprojf.c
+   Contributed by Danny Smith
+   2004-12-24
+*/
+
+#include <math.h>
+#include <complex.h>
+
+/* Return the value of the projection onto the Riemann sphere.*/
+
+float complex cprojf (float complex Z)
+{
+  complex float Res = Z;
+  if (isinf (__real__ Z) || isinf (__imag__ Z))
+    {
+      __real__ Res = HUGE_VALF;
+      __imag__ Res = copysignf (0.0f, __imag__ Z);
+    }
+  return Res;
+}
+