diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index 4fdb820a9..8c542b686 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -150,7 +150,7 @@ std::vector<Path> getUserConfigFiles()
     return files;
 }
 
-unsigned int Settings::getDefaultCores() const
+unsigned int Settings::getDefaultCores()
 {
     const unsigned int concurrency = std::max(1U, std::thread::hardware_concurrency());
     const unsigned int maxCPU = getMaxCPU();
diff --git a/src/libstore/include/nix/store/globals.hh b/src/libstore/include/nix/store/globals.hh
index 14647c05f..f9be1d482 100644
--- a/src/libstore/include/nix/store/globals.hh
+++ b/src/libstore/include/nix/store/globals.hh
@@ -77,7 +77,7 @@ public:
 
     Settings();
 
-    unsigned int getDefaultCores() const;
+    static unsigned int getDefaultCores();
 
     Path nixPrefix;