diff --git a/src/backends/pgfplotsx.jl b/src/backends/pgfplotsx.jl
index af67917b..f97f6e4a 100644
--- a/src/backends/pgfplotsx.jl
+++ b/src/backends/pgfplotsx.jl
@@ -336,7 +336,7 @@ const _pgfx_annotation_halign = KW(
 ## --------------------------------------------------------------------------------------
 # Generates a colormap for pgfplots based on a ColorGradient
 # TODO: maybe obsolete
-pgfx_arrow(::Nothing) = "-"
+pgfx_arrow(::Nothing) = "every arrow/.append style={-}"
 function pgfx_arrow( arr::Arrow )
     components = String[]
     head = String[]