diff --git a/src/systemcmds/tests/CMakeLists.txt b/src/systemcmds/tests/CMakeLists.txt
index 74cb863c77..1d75912e31 100644
--- a/src/systemcmds/tests/CMakeLists.txt
+++ b/src/systemcmds/tests/CMakeLists.txt
@@ -42,7 +42,7 @@ set(srcs
 	test_float.cpp
 	test_gpio.c
 	test_hott_telemetry.c
-	test_hrt.c
+	test_hrt.cpp
 	test_hysteresis.cpp
 	test_int.cpp
 	test_jig_voltages.c
diff --git a/src/systemcmds/tests/test_hrt.c b/src/systemcmds/tests/test_hrt.cpp
similarity index 100%
rename from src/systemcmds/tests/test_hrt.c
rename to src/systemcmds/tests/test_hrt.cpp