diff --git a/x-pack/legacy/plugins/apm/public/components/app/ServiceMap/cytoscapeOptions.ts b/x-pack/legacy/plugins/apm/public/components/app/ServiceMap/cytoscapeOptions.ts
index 2cb4fdf3b34a61f..bc46eaa915690bf 100644
--- a/x-pack/legacy/plugins/apm/public/components/app/ServiceMap/cytoscapeOptions.ts
+++ b/x-pack/legacy/plugins/apm/public/components/app/ServiceMap/cytoscapeOptions.ts
@@ -62,6 +62,7 @@ const style: cytoscape.Stylesheet[] = [
     style: {
       'curve-style': 'bezier',
       'line-color': theme.euiColorMediumShade,
+      'target-arrow-color': theme.euiColorMediumShade,
       'target-arrow-shape': 'triangle',
       // The DefinitelyTyped definitions don't specify this property since it's
       // fairly new.