diff --git a/src/core/comm/InjectionPointStepsMessage.proto b/src/core/comm/InjectionPointStepsMessage.proto
index d875d0f6..d3c7e806 100644
--- a/src/core/comm/InjectionPointStepsMessage.proto
+++ b/src/core/comm/InjectionPointStepsMessage.proto
@@ -1,3 +1,3 @@
 message InjectionPointMessage {
-	required int32 injection_instr = 1;
+	required uint32 injection_instr = 1;
 }
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