diff --git a/.changeset/shaggy-spiders-shop.md b/.changeset/shaggy-spiders-shop.md
new file mode 100644
index 0000000000..ae500f1e81
--- /dev/null
+++ b/.changeset/shaggy-spiders-shop.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-sonarqube': patch
+---
+
+Display '-' instead of 'undefined' if no code coverage is reported.
diff --git a/plugins/sonarqube/src/components/SonarQubeCard/SonarQubeCard.tsx b/plugins/sonarqube/src/components/SonarQubeCard/SonarQubeCard.tsx
index 12ed5b3bf4..14b8ae1af6 100644
--- a/plugins/sonarqube/src/components/SonarQubeCard/SonarQubeCard.tsx
+++ b/plugins/sonarqube/src/components/SonarQubeCard/SonarQubeCard.tsx
@@ -232,7 +232,15 @@ export const SonarQubeCard = ({
                 link={value.getComponentMeasuresUrl('COVERAGE')}
                 title="Coverage"
                 leftSlot={<Percentage value={value.metrics.coverage} />}
-                rightSlot={<Value value={`${value.metrics.coverage}%`} />}
+                rightSlot={
+                  <Value
+                    value={
+                      value.metrics.coverage !== undefined
+                        ? `${value.metrics.coverage}%`
+                        : '—'
+                    }
+                  />
+                }
               />
               <RatingCard
                 title="Duplications"