diff --git a/main/src/main/scala/sbt/internal/InternalDependencies.scala b/main/src/main/scala/sbt/internal/InternalDependencies.scala
index 9dc447831..6808f5e6a 100644
--- a/main/src/main/scala/sbt/internal/InternalDependencies.scala
+++ b/main/src/main/scala/sbt/internal/InternalDependencies.scala
@@ -14,19 +14,21 @@ private[sbt] object InternalDependencies {
   def configurations: Def.Initialize[Seq[(ProjectRef, Set[String])]] = Def.setting {
     val allConfigs = Classpaths.allConfigs(configuration.value).map(_.name).toSet
     val ref = thisProjectRef.value
+    val projectDependencies = buildDependencies.value.classpath.get(ref).toSeq.flatten
     val applicableConfigs = allConfigs + "*"
-    ((ref -> allConfigs) +: buildDependencies.value.classpath
-      .get(ref)
-      .toSeq
-      .flatMap(_.flatMap {
+    ((ref -> allConfigs) +:
+      projectDependencies.flatMap {
         case ResolvedClasspathDependency(p, rawConfigs) =>
           val configs = rawConfigs.getOrElse("*->compile").split(";").flatMap { config =>
             config.split("->") match {
               case Array(n, c) if applicableConfigs.contains(n) => Some(c)
-              case _                                            => None
+              case Array(n) if applicableConfigs.contains(n)    =>
+                // "test" is equivalent to "compile->test"
+                Some("compile")
+              case _ => None
             }
           }
           if (configs.isEmpty) None else Some(p -> configs.toSet)
-      })).distinct
+      }).distinct
   }
 }
diff --git a/sbt/src/sbt-test/project/bsp-internal-dependency-configs/build.sbt b/sbt/src/sbt-test/project/bsp-internal-dependency-configs/build.sbt
new file mode 100644
index 000000000..bc3f2d431
--- /dev/null
+++ b/sbt/src/sbt-test/project/bsp-internal-dependency-configs/build.sbt
@@ -0,0 +1,19 @@
+lazy val a = project.in(file("a")).dependsOn(b % Test)
+
+lazy val b = project.in(file("b")).dependsOn(c)
+
+lazy val c = project.in(file("c"))
+
+def getConfigs(key: SettingKey[Seq[(ProjectRef, Set[ConfigKey])]]):
+  Def.Initialize[Map[String, Set[String]]] =
+    Def.setting(key.value.map { case (p, c) => p.project -> c.map(_.name) }.toMap)
+
+TaskKey[Unit]("check") := {
+  val testDeps = getConfigs(a / Test / bspInternalDependencyConfigurations).value
+  val expected = Map(
+    "a" -> Set("compile", "test"),
+    "b" -> Set("compile"),
+    "c" -> Set("compile")
+  )
+  assert(testDeps == expected)
+}
diff --git a/sbt/src/sbt-test/project/bsp-internal-dependency-configs/test b/sbt/src/sbt-test/project/bsp-internal-dependency-configs/test
new file mode 100644
index 000000000..15675b169
--- /dev/null
+++ b/sbt/src/sbt-test/project/bsp-internal-dependency-configs/test
@@ -0,0 +1 @@
+> check