diff --git a/basis/prettyprint/stylesheet/stylesheet.factor b/basis/prettyprint/stylesheet/stylesheet.factor
index ccdedde73d..54710dd293 100644
--- a/basis/prettyprint/stylesheet/stylesheet.factor
+++ b/basis/prettyprint/stylesheet/stylesheet.factor
@@ -52,7 +52,7 @@ H{
 
 SYMBOL: stack-effect-style
 H{
-    { foreground COLOR: FactorDarkGreen }
+    { foreground COLOR: FactorDarkSlateBlue }
     { font-style plain }
 } stack-effect-style set-global
 
diff --git a/basis/ui/theme/theme.factor b/basis/ui/theme/theme.factor
index f6341503b3..212280347e 100644
--- a/basis/ui/theme/theme.factor
+++ b/basis/ui/theme/theme.factor
@@ -166,7 +166,7 @@ M: light-theme prompt-background-color T{ rgba f 1 0.7 0.7 1 } ;
 M: light-theme dim-color COLOR: gray35 ;
 M: light-theme highlighted-word-color COLOR: DarkSlateGray ;
 M: light-theme string-color COLOR: LightSalmon4 ;
-M: light-theme stack-effect-color COLOR: FactorDarkGreen ;
+M: light-theme stack-effect-color COLOR: FactorDarkSlateBlue ;
 
 M: light-theme vocab-background-color COLOR: FactorLightTan ;
 M: light-theme vocab-border-color COLOR: FactorDarkTan ;