diff --git a/core/jacoco.mk b/core/jacoco.mk
index f51790d..6406df4 100644
--- a/core/jacoco.mk
+++ b/core/jacoco.mk
@@ -84,8 +84,8 @@
 	mkdir -p $(PRIVATE_INSTRUMENTED_PATH)
 	java -jar $(JACOCO_CLI_JAR) \
 	  instrument \
-	  -quiet \
-	  -dest '$(PRIVATE_INSTRUMENTED_PATH)' \
+	  --quiet \
+	  --dest '$(PRIVATE_INSTRUMENTED_PATH)' \
 	  $(PRIVATE_UNZIPPED_PATH)
 	touch $(PRIVATE_INSTRUMENTED_TIMESTAMP_PATH)