diff --git a/src/utils.jl b/src/utils.jl
index de151353..322f6d47 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -305,11 +305,9 @@ function heatmap_edges(
     ismidpoints = prod(z_size) == (ny * nx)
     isedges = z_size == (ny - 1, nx - 1)
     if !ismidpoints && !isedges
-        error(
-            """Length of x & y does not match the size of z.
-              Must be either `size(z) == (length(y), length(x))` (x & y define midpoints)
-              or `size(z) == (length(y)+1, length(x)+1))` (x & y define edges).""",
-        )
+        error("""Length of x & y does not match the size of z.
+                Must be either `size(z) == (length(y), length(x))` (x & y define midpoints)
+                or `size(z) == (length(y)+1, length(x)+1))` (x & y define edges).""")
     end
     x, y = heatmap_edges(x, xscale, isedges), heatmap_edges(y, yscale, isedges, ispolar) # special handle for `r` in polar plots
     return x, y