diff --git a/src/EntityManager.cpp b/src/entity_manager.cpp
similarity index 99%
rename from src/EntityManager.cpp
rename to src/entity_manager.cpp
index 8f29f92..641d3f9 100644
--- a/src/EntityManager.cpp
+++ b/src/entity_manager.cpp
@@ -13,13 +13,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
-/// \file EntityManager.cpp
+/// \file entity_manager.cpp
 
-#include "EntityManager.hpp"
+#include "entity_manager.hpp"
 
-#include "Overlay.hpp"
-#include "Utils.hpp"
-#include "VariantVisitors.hpp"
+#include "overlay.hpp"
+#include "utils.hpp"
+#include "variant_visitors.hpp"
 
 #include <boost/algorithm/string/case_conv.hpp>
 #include <boost/algorithm/string/classification.hpp>
diff --git a/src/Expression.cpp b/src/expression.cpp
similarity index 98%
rename from src/Expression.cpp
rename to src/expression.cpp
index 34be337..50fcbe3 100644
--- a/src/Expression.cpp
+++ b/src/expression.cpp
@@ -15,7 +15,7 @@
 // limitations under the License.
 */
 
-#include "Expression.hpp"
+#include "expression.hpp"
 
 #include <iostream>
 #include <stdexcept>
diff --git a/src/FruDevice.cpp b/src/fru_device.cpp
similarity index 99%
rename from src/FruDevice.cpp
rename to src/fru_device.cpp
index 86644fd..af53e7f 100644
--- a/src/FruDevice.cpp
+++ b/src/fru_device.cpp
@@ -13,10 +13,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
-/// \file FruDevice.cpp
+/// \file fru_device.cpp
 
-#include "FruUtils.hpp"
-#include "Utils.hpp"
+#include "fru_utils.hpp"
+#include "utils.hpp"
 
 #include <fcntl.h>
 #include <sys/inotify.h>
diff --git a/src/FruUtils.cpp b/src/fru_utils.cpp
similarity index 99%
rename from src/FruUtils.cpp
rename to src/fru_utils.cpp
index 70f461c..62390c6 100644
--- a/src/FruUtils.cpp
+++ b/src/fru_utils.cpp
@@ -13,9 +13,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
-/// \file FruUtils.cpp
+/// \file fru_utils.cpp
 
-#include "FruUtils.hpp"
+#include "fru_utils.hpp"
 
 #include <array>
 #include <cstdint>
diff --git a/src/meson.build b/src/meson.build
index 411f0d4..8ddb21e 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -3,12 +3,12 @@
 
 executable(
     'entity-manager',
-    'EntityManager.cpp',
-    'Expression.cpp',
-    'PerformScan.cpp',
-    'PerformProbe.cpp',
-    'Overlay.cpp',
-    'Utils.cpp',
+    'entity_manager.cpp',
+    'expression.cpp',
+    'perform_scan.cpp',
+    'perform_probe.cpp',
+    'overlay.cpp',
+    'utils.cpp',
     cpp_args: cpp_args + ['-DBOOST_ASIO_DISABLE_THREADS'],
     dependencies: [
         boost,
@@ -28,10 +28,10 @@
     endif
     executable(
         'fru-device',
-        'Expression.cpp',
-        'FruDevice.cpp',
-        'Utils.cpp',
-        'FruUtils.cpp',
+        'expression.cpp',
+        'fru_device.cpp',
+        'utils.cpp',
+        'fru_utils.cpp',
         cpp_args: cpp_args_fd,
         dependencies: [
             boost,
diff --git a/src/Overlay.cpp b/src/overlay.cpp
similarity index 99%
rename from src/Overlay.cpp
rename to src/overlay.cpp
index 4454423..1d99a79 100644
--- a/src/Overlay.cpp
+++ b/src/overlay.cpp
@@ -13,11 +13,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
-/// \file Overlay.cpp
+/// \file overlay.cpp
 
-#include "Overlay.hpp"
+#include "overlay.hpp"
 
-#include "Utils.hpp"
+#include "utils.hpp"
 #include "devices.hpp"
 
 #include <boost/algorithm/string/predicate.hpp>
diff --git a/src/PerformProbe.cpp b/src/perform_probe.cpp
similarity index 98%
rename from src/PerformProbe.cpp
rename to src/perform_probe.cpp
index af9373c..d5b7f3b 100644
--- a/src/PerformProbe.cpp
+++ b/src/perform_probe.cpp
@@ -13,8 +13,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
-/// \file PerformProbe.cpp
-#include "EntityManager.hpp"
+/// \file perform_probe.cpp
+#include "entity_manager.hpp"
 
 #include <boost/algorithm/string/replace.hpp>
 
diff --git a/src/PerformScan.cpp b/src/perform_scan.cpp
similarity index 99%
rename from src/PerformScan.cpp
rename to src/perform_scan.cpp
index 144b824..959a819 100644
--- a/src/PerformScan.cpp
+++ b/src/perform_scan.cpp
@@ -13,8 +13,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
-/// \file PerformScan.cpp
-#include "EntityManager.hpp"
+/// \file perform_scan.cpp
+#include "entity_manager.hpp"
 
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/asio/steady_timer.hpp>
@@ -23,7 +23,7 @@
 
 #include <charconv>
 
-/* Hacks from splitting EntityManager.cpp */
+/* Hacks from splitting entity_manager.cpp */
 extern std::shared_ptr<sdbusplus::asio::connection> systemBus;
 extern nlohmann::json lastJson;
 extern void
diff --git a/src/Utils.cpp b/src/utils.cpp
similarity index 99%
rename from src/Utils.cpp
rename to src/utils.cpp
index 612e495..8b7386d 100644
--- a/src/Utils.cpp
+++ b/src/utils.cpp
@@ -13,12 +13,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
-/// \file Utils.cpp
+/// \file utils.cpp
 
-#include "Utils.hpp"
+#include "utils.hpp"
 
-#include "Expression.hpp"
-#include "VariantVisitors.hpp"
+#include "expression.hpp"
+#include "variant_visitors.hpp"
 
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/find.hpp>