diff --git a/java/sdk_library.go b/java/sdk_library.go
index 18866d57e..72cce5794 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -668,11 +668,11 @@ func SdkLibraryMutator(mctx android.TopDownMutatorContext) {
 }
 
 func (module *SdkLibrary) createInternalModules(mctx android.TopDownMutatorContext) {
-	if module.Library.Module.properties.Srcs == nil {
+	if len(module.Library.Module.properties.Srcs) == 0 {
 		mctx.PropertyErrorf("srcs", "java_sdk_library must specify srcs")
 	}
 
-	if module.sdkLibraryProperties.Api_packages == nil {
+	if len(module.sdkLibraryProperties.Api_packages) == 0 {
 		mctx.PropertyErrorf("api_packages", "java_sdk_library must specify api_packages")
 	}
 
diff --git a/sysprop/sysprop_library.go b/sysprop/sysprop_library.go
index 6e8e306b4..48078d84e 100644
--- a/sysprop/sysprop_library.go
+++ b/sysprop/sysprop_library.go
@@ -82,7 +82,11 @@ func syspropLibraryFactory() android.Module {
 }
 
 func syspropLibraryHook(ctx android.LoadHookContext, m *syspropLibrary) {
-	if m.syspropLibraryProperties.Api_packages == nil {
+	if len(m.commonProperties.Srcs) == 0 {
+		ctx.PropertyErrorf("srcs", "sysprop_library must specify srcs")
+	}
+
+	if len(m.syspropLibraryProperties.Api_packages) == 0 {
 		ctx.PropertyErrorf("api_packages", "sysprop_library must specify api_packages")
 	}