diff --git a/src/target/breakpoints.h b/src/target/breakpoints.h
index 0a5949594..fc5b50b18 100644
--- a/src/target/breakpoints.h
+++ b/src/target/breakpoints.h
@@ -56,7 +56,7 @@ struct watchpoint {
 	bool is_set;
 	unsigned int number;
 	struct watchpoint *next;
-	int unique_id;
+	uint32_t unique_id;
 };
 
 void breakpoint_clear_target(struct target *target);