diff --git a/R/mcmc-traces.R b/R/mcmc-traces.R
index 21252085..37837912 100644
--- a/R/mcmc-traces.R
+++ b/R/mcmc-traces.R
@@ -719,7 +719,7 @@ mcmc_trace_data <- function(x,
           color = guide_legend(order = 1),
           linetype = guide_legend(
             order = 2, title = NULL, keywidth = rel(1/2),
-            override.aes = list(size = rel(1/2)))
+            override.aes = list(linewidth = rel(1/2)))
         )
       }
     }
diff --git a/tests/testthat/_snaps/mcmc-traces/mcmc-trace-divergences-custom.svg b/tests/testthat/_snaps/mcmc-traces/mcmc-trace-divergences-custom.svg
index b856f48d..b7b9d0b5 100644
--- a/tests/testthat/_snaps/mcmc-traces/mcmc-trace-divergences-custom.svg
+++ b/tests/testthat/_snaps/mcmc-traces/mcmc-trace-divergences-custom.svg
@@ -104,7 +104,7 @@
 <text x='652.36' y='274.05' style='font-size: 13.00px; font-family: sans;' textLength='7.23px' lengthAdjust='spacingAndGlyphs'>2</text>
 <text x='652.36' y='291.33' style='font-size: 13.00px; font-family: sans;' textLength='7.23px' lengthAdjust='spacingAndGlyphs'>3</text>
 <text x='652.36' y='308.61' style='font-size: 13.00px; font-family: sans;' textLength='7.23px' lengthAdjust='spacingAndGlyphs'>4</text>
-<line x1='629.82' y1='345.33' x2='635.58' y2='345.33' style='stroke-width: 0.53; stroke-linecap: butt;' />
+<line x1='629.82' y1='345.33' x2='635.58' y2='345.33' style='stroke-width: 1.07; stroke-linecap: butt;' />
 <text x='642.28' y='349.80' style='font-size: 13.00px; font-family: sans;' textLength='65.77px' lengthAdjust='spacingAndGlyphs'>Divergence</text>
 <text x='33.63' y='15.89' style='font-size: 14.40px; font-family: sans;' textLength='220.13px' lengthAdjust='spacingAndGlyphs'>mcmc_trace divergences (custom)</text>
 </g>
diff --git a/tests/testthat/_snaps/mcmc-traces/mcmc-trace-divergences-default.svg b/tests/testthat/_snaps/mcmc-traces/mcmc-trace-divergences-default.svg
index 2063b26e..0bd292ca 100644
--- a/tests/testthat/_snaps/mcmc-traces/mcmc-trace-divergences-default.svg
+++ b/tests/testthat/_snaps/mcmc-traces/mcmc-trace-divergences-default.svg
@@ -104,7 +104,7 @@
 <text x='652.36' y='274.05' style='font-size: 13.00px; font-family: sans;' textLength='7.23px' lengthAdjust='spacingAndGlyphs'>2</text>
 <text x='652.36' y='291.33' style='font-size: 13.00px; font-family: sans;' textLength='7.23px' lengthAdjust='spacingAndGlyphs'>3</text>
 <text x='652.36' y='308.61' style='font-size: 13.00px; font-family: sans;' textLength='7.23px' lengthAdjust='spacingAndGlyphs'>4</text>
-<line x1='629.82' y1='345.33' x2='635.58' y2='345.33' style='stroke-width: 0.53; stroke: #FF0000; stroke-linecap: butt;' />
+<line x1='629.82' y1='345.33' x2='635.58' y2='345.33' style='stroke-width: 1.07; stroke: #FF0000; stroke-linecap: butt;' />
 <text x='642.28' y='349.80' style='font-size: 13.00px; font-family: sans;' textLength='65.77px' lengthAdjust='spacingAndGlyphs'>Divergence</text>
 <text x='33.63' y='15.89' style='font-size: 14.40px; font-family: sans;' textLength='216.93px' lengthAdjust='spacingAndGlyphs'>mcmc_trace divergences (default)</text>
 </g>