diff --git a/CMakeLists.txt b/CMakeLists.txt
index 708edcf5..7c98b184 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -209,7 +209,6 @@ target_compile_definitions(Monitoring
     $<$<BOOL:${APPLE}>:O2_MONITORING_OS_MAC>
     $<$<BOOL:${LINUX}>:O2_MONITORING_OS_LINUX>
     $<$<BOOL:${CC7}>:O2_MONITORING_OS_CC7>
-    $<$<BOOL:${CS8}>:O2_MONITORING_OS_CS8>
     $<$<BOOL:${ApMon_FOUND}>:O2_MONITORING_WITH_APPMON>
     $<$<BOOL:${RdKafka_FOUND}>:O2_MONITORING_WITH_KAFKA>
     $<$<BOOL:${CURL_FOUND}>:O2_MONITORING_WITH_CURL>
diff --git a/src/ProcessMonitor.cxx b/src/ProcessMonitor.cxx
index c28cf6ab..e8db3a59 100644
--- a/src/ProcessMonitor.cxx
+++ b/src/ProcessMonitor.cxx
@@ -31,11 +31,7 @@ namespace o2
 namespace monitoring
 {
 
-#ifdef O2_MONITORING_OS_CS8
 static constexpr auto SMAPS_FILE = "/proc/self/smaps_rollup";
-#else
-static constexpr auto SMAPS_FILE = "/proc/self/smaps";
-#endif
 
 ProcessMonitor::ProcessMonitor()
 {