diff --git a/MagickCore/colorspace.c b/MagickCore/colorspace.c
index 756ed7b..84440a6 100644
--- a/MagickCore/colorspace.c
+++ b/MagickCore/colorspace.c
@@ -178,7 +178,7 @@
   assert(u != (double *) NULL);
   assert(v != (double *) NULL);
   if ((Y/D50Y) > CIEEpsilon)
-    *L=(double) (116.0*pow(Y/D50Y,1/3.0)-16.0);
+    *L=(double) (116.0*pow(Y/D50Y,1.0/3.0)-16.0);
   else
     *L=CIEK*(Y/D50Y);
   alpha=MagickEpsilonReciprocal(X+15.0*Y+3.0*Z);