diff --git a/src/common-cxx b/src/common-cxx
index f2aa8e61..5a43a946 160000
--- a/src/common-cxx
+++ b/src/common-cxx
@@ -1 +1 @@
-Subproject commit f2aa8e61ed9c7ef0ce2f0bdfb8eeef9984fa68ef
+Subproject commit 5a43a9462719183ed1cdd1921844b7cf34c90c82
diff --git a/src/hash/ConfigHash.cpp b/src/hash/ConfigHash.cpp
index 34ac5222..c5d66dc8 100644
--- a/src/hash/ConfigHash.cpp
+++ b/src/hash/ConfigHash.cpp
@@ -158,7 +158,7 @@ fiftyoneDegreesConfigHash* ConfigHash::getConfig() {
  * Provides the lowest concurrency value in the list of possible concurrencies.
  * @return a 16 bit integer with the minimum concurrency value.
  */
-uint16_t ConfigHash::getConcurrency() {
+uint16_t ConfigHash::getConcurrency() const {
 	uint16_t concurrencies[] = {
 		strings.getConcurrency(),
 		properties.getConcurrency(),
diff --git a/src/hash/ConfigHash.hpp b/src/hash/ConfigHash.hpp
index 47017563..d7059a0e 100644
--- a/src/hash/ConfigHash.hpp
+++ b/src/hash/ConfigHash.hpp
@@ -264,7 +264,7 @@ namespace FiftyoneDegrees {
 				 * concurrencies.
 				 * @return a 16 bit integer with the minimum concurrency value.
 				 */
-				uint16_t getConcurrency();
+				uint16_t getConcurrency() const;
 
 				/**
 				 * Gets whether the route through each graph should be traced