diff --git a/project/Build.scala b/project/Build.scala
index ff2592836ed9..13cb718bf783 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -325,8 +325,8 @@ object Build {
 
   lazy val scalacOptionsDocSettings = Seq(
       "-external-mappings:" +
-        ".*scala.*::scaladoc3::https://dotty.epfl.ch/api/," +
-        ".*java.*::javadoc::https://docs.oracle.com/javase/8/docs/api/",
+        ".*scala/.*::scaladoc3::https://dotty.epfl.ch/api/," +
+        ".*java/.*::javadoc::https://docs.oracle.com/javase/8/docs/api/",
       "-skip-by-regex:.+\\.internal($|\\..+)",
       "-skip-by-regex:.+\\.impl($|\\..+)",
       "-project-logo", "docs/logo.svg",
diff --git a/project/scripts/cmdScaladocTests b/project/scripts/cmdScaladocTests
index 2826c7521e09..29d4dd6c526c 100755
--- a/project/scripts/cmdScaladocTests
+++ b/project/scripts/cmdScaladocTests
@@ -26,7 +26,7 @@ dist/target/pack/bin/scaladoc \
   -source-links:out/bootstrap/stdlib-bootstrapped/scala-"${DOTTY_NONBOOTSTRAPPED_VERSION}"/src_managed/main/scala-library-src=github://scala/scala/v"${STDLIB_VERSION}"#src/library \
   -source-links:out/bootstrap/stdlib-bootstrapped/scala-"${DOTTY_NONBOOTSTRAPPED_VERSION}"/src_managed/main/dotty-library-src=github://"${GITHUB_REPOSITORY}"/"${GITHUB_SHA}"\#library/src \
   -source-links:github://"${GITHUB_REPOSITORY}"/"${GITHUB_SHA}" \
-  "-external-mappings:.*scala.*::scaladoc3::https://dotty.epfl.ch/api/,.*java.*::javadoc::https://docs.oracle.com/javase/8/docs/api/" \
+  "-external-mappings:.*scala/.*::scaladoc3::https://dotty.epfl.ch/api/,.*java/.*::javadoc::https://docs.oracle.com/javase/8/docs/api/" \
   "-skip-by-regex:.+\.internal($|\..+)" \
   "-skip-by-regex:.+\.impl($|\..+)" \
   -project-logo docs/logo.svg \