diff --git a/fairmq/CMakeLists.txt b/fairmq/CMakeLists.txt
index 2ed5b3ee..eb6bed44 100644
--- a/fairmq/CMakeLists.txt
+++ b/fairmq/CMakeLists.txt
@@ -249,6 +249,7 @@ if(BUILD_FAIRMQ)
     TransportFactory.cxx
     plugins/config/Config.cxx
     plugins/control/Control.cxx
+    shmem/Common.cxx
     shmem/Manager.cxx
     shmem/Monitor.cxx
   )
@@ -385,7 +386,7 @@ if(BUILD_FAIRMQ)
     fairmq_target_tidy(TARGET fairmq-splitter)
   endif()
 
-  add_executable(fairmq-shmmonitor shmem/Monitor.cxx shmem/Monitor.h shmem/runMonitor.cxx)
+  add_executable(fairmq-shmmonitor shmem/Common.cxx shmem/Monitor.cxx shmem/Monitor.h shmem/runMonitor.cxx)
   target_compile_features(fairmq-shmmonitor PUBLIC cxx_std_17)
   target_compile_definitions(fairmq-shmmonitor PUBLIC BOOST_ERROR_CODE_HEADER_ONLY)
   if(FAIRMQ_DEBUG_MODE)
diff --git a/fairmq/shmem/Common.cxx b/fairmq/shmem/Common.cxx
new file mode 100644
index 00000000..78fec8f7
--- /dev/null
+++ b/fairmq/shmem/Common.cxx
@@ -0,0 +1,48 @@
+/********************************************************************************
+ *    Copyright (C) 2021 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH    *
+ *                                                                              *
+ *              This software is distributed under the terms of the             *
+ *              GNU Lesser General Public Licence (LGPL) version 3,             *
+ *                  copied verbatim in the file "LICENSE"                       *
+ ********************************************************************************/
+
+#include "Common.h"
+
+#include <picosha2.h>
+
+#include <unistd.h>
+
+#include <sstream>
+#include <string>
+
+namespace fair::mq::shmem
+{
+
+std::string makeShmIdStr(const std::string& sessionId, const std::string& userId)
+{
+    std::string seed(userId + sessionId);
+    // generate a 8-digit hex value out of sha256 hash
+    std::vector<unsigned char> hash(4);
+    picosha2::hash256(seed.begin(), seed.end(), hash.begin(), hash.end());
+
+    return picosha2::bytes_to_hex_string(hash.begin(), hash.end());
+}
+
+std::string makeShmIdStr(const std::string& sessionId)
+{
+    return makeShmIdStr(sessionId, std::to_string(geteuid()));
+}
+
+uint64_t makeShmIdUint64(const std::string& sessionId)
+{
+    std::string shmId = makeShmIdStr(sessionId);
+    uint64_t id = 0;
+    std::stringstream ss;
+    ss << std::hex << shmId;
+    ss >> id;
+
+    return id;
+}
+
+
+}   // namespace fair::mq::shmem
diff --git a/fairmq/shmem/Common.h b/fairmq/shmem/Common.h
index b90a93e2..63f1ae52 100644
--- a/fairmq/shmem/Common.h
+++ b/fairmq/shmem/Common.h
@@ -8,10 +8,7 @@
 #ifndef FAIR_MQ_SHMEM_COMMON_H_
 #define FAIR_MQ_SHMEM_COMMON_H_
 
-#include <picosha2.h>
-
 #include <atomic>
-#include <sstream>
 #include <string>
 #include <functional> // std::equal_to
 
@@ -26,7 +23,6 @@
 #include <boost/unordered_map.hpp>
 #include <boost/variant.hpp>
 
-#include <unistd.h>
 #include <sys/types.h>
 
 namespace fair::mq::shmem
@@ -212,31 +208,9 @@ struct RegionBlock
 
 // find id for unique shmem name:
 // a hash of user id + session id, truncated to 8 characters (to accommodate for name size limit on some systems (MacOS)).
-inline std::string makeShmIdStr(const std::string& sessionId, const std::string& userId)
-{
-    std::string seed(userId + sessionId);
-    // generate a 8-digit hex value out of sha256 hash
-    std::vector<unsigned char> hash(4);
-    picosha2::hash256(seed.begin(), seed.end(), hash.begin(), hash.end());
-
-    return picosha2::bytes_to_hex_string(hash.begin(), hash.end());
-}
-
-inline std::string makeShmIdStr(const std::string& sessionId)
-{
-    return makeShmIdStr(sessionId, std::to_string(geteuid()));
-}
-
-inline uint64_t makeShmIdUint64(const std::string& sessionId)
-{
-    std::string shmId = makeShmIdStr(sessionId);
-    uint64_t id = 0;
-    std::stringstream ss;
-    ss << std::hex << shmId;
-    ss >> id;
-
-    return id;
-}
+std::string makeShmIdStr(const std::string& sessionId, const std::string& userId);
+std::string makeShmIdStr(const std::string& sessionId);
+uint64_t makeShmIdUint64(const std::string& sessionId);
 
 struct SegmentSize : public boost::static_visitor<size_t>
 {