diff --git a/scala_proto/scala_proto.bzl b/scala_proto/scala_proto.bzl
index b598f2c9b..bb9f7756a 100644
--- a/scala_proto/scala_proto.bzl
+++ b/scala_proto/scala_proto.bzl
@@ -320,7 +320,7 @@ def _colon_paths(data):
 
 def _gen_proto_srcjar_impl(ctx):
     acc_imports = depset()
-    transitive_proto_path_flags = depset()
+    transitive_proto_paths = depset()
 
     proto_deps, jvm_deps = [], []
     for target in ctx.attr.deps:
@@ -328,8 +328,8 @@ def _gen_proto_srcjar_impl(ctx):
             proto_deps.append(target)
             acc_imports += target.proto.transitive_sources
             #inline this if after 0.12.0 is the oldest supported version
-            if hasattr(target.proto, 'transitive_proto_path_flags'):
-              transitive_proto_path_flags += target.proto.transitive_proto_path_flags
+            if hasattr(target.proto, 'transitive_proto_path'):
+              transitive_proto_paths += target.proto.transitive_proto_path
         else:
             jvm_deps.append(target)
 
@@ -344,7 +344,7 @@ def _gen_proto_srcjar_impl(ctx):
         # Command line args to worker cannot be empty so using padding
         flags_arg = "-" + ",".join(ctx.attr.flags),
         # Command line args to worker cannot be empty so using padding
-        packages = "-" + ":".join(transitive_proto_path_flags.to_list())
+        packages = "-" + ":".join(transitive_proto_paths.to_list())
     )
     argfile = ctx.new_file(ctx.outputs.srcjar, "%s_worker_input" % ctx.label.name)
     ctx.file_action(output=argfile, content=worker_content)
diff --git a/src/scala/scripts/PBGenerateRequest.scala b/src/scala/scripts/PBGenerateRequest.scala
index b38c16c1c..091d0c02a 100644
--- a/src/scala/scripts/PBGenerateRequest.scala
+++ b/src/scala/scripts/PBGenerateRequest.scala
@@ -5,6 +5,7 @@ import java.nio.file.{Files, Path, Paths}
 class PBGenerateRequest(val jarOutput: String, val scalaPBOutput: Path, val scalaPBArgs: List[String])
 
 object PBGenerateRequest {
+
   def from(args: java.util.List[String]): PBGenerateRequest = {
     val jarOutput = args.get(0)
     val parsedProtoFiles = args.get(1).split(':').toList.map { rootAndFile =>
@@ -31,15 +32,20 @@ object PBGenerateRequest {
       case s if s.charAt(0) == '-' => Some(s.tail) //drop padding character
       case other => sys.error(s"expected a padding character of - (dash), but found: $other")
     }
-    val transitiveProtoPathFlags = args.get(3) match {
+    val transitiveProtoPaths = args.get(3) match {
       case "-" => Nil
       case s if s.charAt(0) == '-' => s.tail.split(':').toList //drop padding character
       case other => sys.error(s"expected a padding character of - (dash), but found: $other")
     }
+
     val tmp = Paths.get(Option(System.getProperty("java.io.tmpdir")).getOrElse("/tmp"))
     val scalaPBOutput = Files.createTempDirectory(tmp, "bazelscalapb")
     val flagPrefix = flagOpt.fold("")(_ + ":")
-    val scalaPBArgs = s"--scala_out=$flagPrefix$scalaPBOutput" :: (transitiveProtoPathFlags ++ imports ++ protoFiles)
+    val scalaPBArgs = s"--scala_out=$flagPrefix$scalaPBOutput" :: (padWithProtoPathPrefix(transitiveProtoPaths) ++ imports ++ protoFiles)
     new PBGenerateRequest(jarOutput, scalaPBOutput, scalaPBArgs)
   }
+
+  private def padWithProtoPathPrefix(transitiveProtoPathFlags: List[String]) =
+    transitiveProtoPathFlags.map("--proto_path="+_)
+
 }
\ No newline at end of file