diff --git a/apex/apex_test.go b/apex/apex_test.go
index 4829029..7b01b94 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -6568,6 +6568,73 @@
 	return result.TestContext
 }
 
+func TestDuplicateDeapexeresFromPrebuiltApexes(t *testing.T) {
+	preparers := android.GroupFixturePreparers(
+		java.PrepareForTestWithJavaDefaultModules,
+		PrepareForTestWithApexBuildComponents,
+	).
+		ExtendWithErrorHandler(android.FixtureExpectsAtLeastOneErrorMatchingPattern(
+			`Ambiguous duplicate deapexer module dependencies "com.android.myapex.deapexer" and "com.mycompany.android.myapex.deapexer"`))
+
+	bpBase := `
+		apex_set {
+			name: "com.android.myapex",
+			exported_bootclasspath_fragments: ["my-bootclasspath-fragment"],
+			set: "myapex.apks",
+		}
+
+		apex_set {
+			name: "com.mycompany.android.myapex",
+			apex_name: "com.android.myapex",
+			exported_bootclasspath_fragments: ["my-bootclasspath-fragment"],
+			set: "company-myapex.apks",
+		}
+
+		prebuilt_bootclasspath_fragment {
+			name: "my-bootclasspath-fragment",
+			apex_available: ["com.android.myapex"],
+			%s
+		}
+	`
+
+	t.Run("java_import", func(t *testing.T) {
+		_ = preparers.RunTestWithBp(t, fmt.Sprintf(bpBase, `contents: ["libfoo"]`)+`
+			java_import {
+				name: "libfoo",
+				jars: ["libfoo.jar"],
+				apex_available: ["com.android.myapex"],
+			}
+		`)
+	})
+
+	t.Run("java_sdk_library_import", func(t *testing.T) {
+		_ = preparers.RunTestWithBp(t, fmt.Sprintf(bpBase, `contents: ["libfoo"]`)+`
+			java_sdk_library_import {
+				name: "libfoo",
+				public: {
+					jars: ["libbar.jar"],
+				},
+				apex_available: ["com.android.myapex"],
+			}
+		`)
+	})
+
+	t.Run("prebuilt_bootclasspath_fragment", func(t *testing.T) {
+		_ = preparers.RunTestWithBp(t, fmt.Sprintf(bpBase, `
+			image_name: "art",
+			contents: ["libfoo"],
+		`)+`
+			java_sdk_library_import {
+				name: "libfoo",
+				public: {
+					jars: ["libbar.jar"],
+				},
+				apex_available: ["com.android.myapex"],
+			}
+		`)
+	})
+}
+
 func TestUpdatable_should_set_min_sdk_version(t *testing.T) {
 	testApexError(t, `"myapex" .*: updatable: updatable APEXes should set min_sdk_version`, `
 		apex {
diff --git a/java/bootclasspath_fragment.go b/java/bootclasspath_fragment.go
index 73dcd19..35eb1f0 100644
--- a/java/bootclasspath_fragment.go
+++ b/java/bootclasspath_fragment.go
@@ -933,11 +933,15 @@
 	}
 
 	var deapexerModule android.Module
-	ctx.VisitDirectDeps(func(module android.Module) {
-		tag := ctx.OtherModuleDependencyTag(module)
+	ctx.VisitDirectDeps(func(to android.Module) {
+		tag := ctx.OtherModuleDependencyTag(to)
 		// Save away the `deapexer` module on which this depends, if any.
 		if tag == android.DeapexerTag {
-			deapexerModule = module
+			if deapexerModule != nil {
+				ctx.ModuleErrorf("Ambiguous duplicate deapexer module dependencies %q and %q",
+					deapexerModule.Name(), to.Name())
+			}
+			deapexerModule = to
 		}
 	})
 
diff --git a/java/java.go b/java/java.go
index 71c1b33..ca63782 100644
--- a/java/java.go
+++ b/java/java.go
@@ -1283,6 +1283,10 @@
 
 		// Save away the `deapexer` module on which this depends, if any.
 		if tag == android.DeapexerTag {
+			if deapexerModule != nil {
+				ctx.ModuleErrorf("Ambiguous duplicate deapexer module dependencies %q and %q",
+					deapexerModule.Name(), module.Name())
+			}
 			deapexerModule = module
 		}
 	})
diff --git a/java/sdk_library.go b/java/sdk_library.go
index d7f53ec..f2d0c59 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -2160,6 +2160,10 @@
 
 		// Save away the `deapexer` module on which this depends, if any.
 		if tag == android.DeapexerTag {
+			if deapexerModule != nil {
+				ctx.ModuleErrorf("Ambiguous duplicate deapexer module dependencies %q and %q",
+					deapexerModule.Name(), to.Name())
+			}
 			deapexerModule = to
 		}
 	})