diff --git a/R/guide-axis.R b/R/guide-axis.R
index dc57ffd23e..8790a8891d 100644
--- a/R/guide-axis.R
+++ b/R/guide-axis.R
@@ -242,6 +242,8 @@ GuideAxis <- ggproto(
   },
 
   setup_elements = function(params, elements, theme) {
+    theme$axis.line <- theme$axis.line %||% element_line(inherit.blank = TRUE)
+    theme$axis.line$lineend <- theme$axis.line$lineend %||% "square"
     is_char <- vapply(elements, is.character, logical(1))
     suffix <- params$theme_suffix %||%
       paste(params$aes, params$position, sep = ".")
diff --git a/tests/testthat/_snaps/guides/axis-guides-basic.svg b/tests/testthat/_snaps/guides/axis-guides-basic.svg
index ae2a74c24d..3e8f03b081 100644
--- a/tests/testthat/_snaps/guides/axis-guides-basic.svg
+++ b/tests/testthat/_snaps/guides/axis-guides-basic.svg
@@ -59,28 +59,28 @@
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diff --git a/tests/testthat/_snaps/guides/axis-guides-check-overlap.svg b/tests/testthat/_snaps/guides/axis-guides-check-overlap.svg
index cf2312f98c..a6f43d3d78 100644
--- a/tests/testthat/_snaps/guides/axis-guides-check-overlap.svg
+++ b/tests/testthat/_snaps/guides/axis-guides-check-overlap.svg
@@ -59,7 +59,7 @@
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@@ -89,7 +89,7 @@
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-<polyline points='36.00,547.20 36.00,28.80 ' style='stroke-width: 1.07; stroke-linecap: butt;' />
+<polyline points='36.00,547.20 36.00,28.80 ' style='stroke-width: 1.07; stroke-linecap: square;' />
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@@ -130,7 +130,7 @@
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-<polyline points='36.00,28.80 684.00,28.80 ' style='stroke-width: 1.07; stroke-linecap: butt;' />
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@@ -160,7 +160,7 @@
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diff --git a/tests/testthat/_snaps/guides/axis-guides-negative-rotation.svg b/tests/testthat/_snaps/guides/axis-guides-negative-rotation.svg
index f5ad2b2273..653f94f8fc 100644
--- a/tests/testthat/_snaps/guides/axis-guides-negative-rotation.svg
+++ b/tests/testthat/_snaps/guides/axis-guides-negative-rotation.svg
@@ -59,7 +59,7 @@
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@@ -80,7 +80,7 @@
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diff --git a/tests/testthat/_snaps/guides/axis-guides-positive-rotation.svg b/tests/testthat/_snaps/guides/axis-guides-positive-rotation.svg
index e1cd91eb77..70f3e16941 100644
--- a/tests/testthat/_snaps/guides/axis-guides-positive-rotation.svg
+++ b/tests/testthat/_snaps/guides/axis-guides-positive-rotation.svg
@@ -59,7 +59,7 @@
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diff --git a/tests/testthat/_snaps/guides/axis-guides-text-dodged-into-rows-cols.svg b/tests/testthat/_snaps/guides/axis-guides-text-dodged-into-rows-cols.svg
index 79e94af549..582e446d68 100644
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index 393ffb017b..f50e7c4888 100644
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index 9ed86845f6..cc3bf12f57 100644
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index 18609a9a74..b4787142cf 100644
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diff --git a/tests/testthat/_snaps/theme/theme-classic-large.svg b/tests/testthat/_snaps/theme/theme-classic-large.svg
index 96767cc14f..e1f3f7c793 100644
--- a/tests/testthat/_snaps/theme/theme-classic-large.svg
+++ b/tests/testthat/_snaps/theme/theme-classic-large.svg
@@ -43,7 +43,7 @@
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 </g>
 <g clip-path='url(#cpMC4wMHw3MjAuMDB8MC4wMHw1NzYuMDA=)'>
-<polyline points='105.71,483.34 589.41,483.34 ' style='stroke-width: 3.20; stroke-linecap: butt;' />
+<polyline points='105.71,483.34 589.41,483.34 ' style='stroke-width: 3.20; stroke-linecap: square;' />
 <polyline points='127.70,491.56 127.70,483.34 ' style='stroke-width: 3.20; stroke: #333333; stroke-linecap: butt;' />
 <polyline points='237.63,491.56 237.63,483.34 ' style='stroke-width: 3.20; stroke: #333333; stroke-linecap: butt;' />
 <polyline points='347.56,491.56 347.56,483.34 ' style='stroke-width: 3.20; stroke: #333333; stroke-linecap: butt;' />
@@ -54,7 +54,7 @@
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-<polyline points='105.71,483.34 105.71,118.30 ' style='stroke-width: 3.20; stroke-linecap: butt;' />
+<polyline points='105.71,483.34 105.71,118.30 ' style='stroke-width: 3.20; stroke-linecap: square;' />
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diff --git a/tests/testthat/_snaps/theme/theme-classic.svg b/tests/testthat/_snaps/theme/theme-classic.svg
index 8588be9819..d1a77a131e 100644
--- a/tests/testthat/_snaps/theme/theme-classic.svg
+++ b/tests/testthat/_snaps/theme/theme-classic.svg
@@ -43,7 +43,7 @@
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 <g clip-path='url(#cpMC4wMHw3MjAuMDB8MC4wMHw1NzYuMDA=)'>
-<polyline points='35.24,545.11 664.95,545.11 ' style='stroke-width: 1.07; stroke-linecap: butt;' />
+<polyline points='35.24,545.11 664.95,545.11 ' style='stroke-width: 1.07; stroke-linecap: square;' />
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@@ -54,7 +54,7 @@
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-<polyline points='35.24,545.11 35.24,39.43 ' style='stroke-width: 1.07; stroke-linecap: butt;' />
+<polyline points='35.24,545.11 35.24,39.43 ' style='stroke-width: 1.07; stroke-linecap: square;' />
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