diff --git a/.gitignore b/.gitignore
index 68ad7d72..45e1ecf0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -291,3 +291,4 @@ __pycache__/
 
 # Docker test packages
 dockertests/app-packages/
+.protoc-dependencies
diff --git a/pom.xml b/pom.xml
index a483d766..81757ca2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -199,6 +199,13 @@
               <goal>shade</goal>
             </goals>
             <configuration>
+              <!-- Write the reduced POM inside target/ so it never poisons
+                   incremental builds. When dependency-reduced-pom.xml lands
+                   in the project root, a subsequent "mvn package" (without
+                   clean) reads it instead of pom.xml, loses the protobuf/gRPC
+                   dependencies, and the shade plugin produces a JAR without
+                   StreamingMessage and other generated gRPC classes.  -->
+              <dependencyReducedPomLocation>${project.build.directory}/dependency-reduced-pom.xml</dependencyReducedPomLocation>
               <transformers>
                 <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                   <mainClass>com.microsoft.azure.functions.worker.Application</mainClass>