diff --git a/exporters/sender/okhttp/src/test/java/io/opentelemetry/exporter/sender/okhttp/internal/OkHttpGrpcSenderTest.java b/exporters/sender/okhttp/src/test/java/io/opentelemetry/exporter/sender/okhttp/internal/OkHttpGrpcSenderTest.java
index b5b99877cb2..63a69ffabe4 100644
--- a/exporters/sender/okhttp/src/test/java/io/opentelemetry/exporter/sender/okhttp/internal/OkHttpGrpcSenderTest.java
+++ b/exporters/sender/okhttp/src/test/java/io/opentelemetry/exporter/sender/okhttp/internal/OkHttpGrpcSenderTest.java
@@ -88,6 +88,7 @@ void send_rejectedExecution_callsOnError() {
     sender.send(new TestMessageWriter(), responseRef::set, errorRef::set);
 
     assertThat(errorRef.get()).isNotNull();
+    assertThat(errorRef.get()).hasMessageContaining("executor rejected");
     assertThat(responseRef.get()).isNull();
   }
 
diff --git a/exporters/sender/okhttp/src/test/java/io/opentelemetry/exporter/sender/okhttp/internal/OkHttpHttpSenderTest.java b/exporters/sender/okhttp/src/test/java/io/opentelemetry/exporter/sender/okhttp/internal/OkHttpHttpSenderTest.java
index 251b85ca63a..994e9a99985 100644
--- a/exporters/sender/okhttp/src/test/java/io/opentelemetry/exporter/sender/okhttp/internal/OkHttpHttpSenderTest.java
+++ b/exporters/sender/okhttp/src/test/java/io/opentelemetry/exporter/sender/okhttp/internal/OkHttpHttpSenderTest.java
@@ -75,6 +75,7 @@ void send_rejectedExecution_callsOnError() {
     sender.send(new NoOpRequestBodyWriter(), responseRef::set, errorRef::set);
 
     assertThat(errorRef.get()).isNotNull();
+    assertThat(errorRef.get()).hasMessageContaining("executor rejected");
     assertThat(responseRef.get()).isNull();
   }