diff --git a/app/operations/layer-modes/gimpoperationlchchroma.c b/app/operations/layer-modes/gimpoperationlchchroma.c
index b1bf8d76f3..5a08911376 100644
--- a/app/operations/layer-modes/gimpoperationlchchroma.c
+++ b/app/operations/layer-modes/gimpoperationlchchroma.c
@@ -110,7 +110,7 @@ chroma_pre_process (const Babl   *from_fish,
         {
           gfloat A2 = layer_lab[4 * i + 1];
           gfloat B2 = layer_lab[4 * i + 2];
-          gfloat c2 = hypot (A2, B2);
+          gfloat c2 = hypotf (A2, B2);
           gfloat A  = c2 * A1 / c1;
           gfloat B  = c2 * B1 / c1;