diff --git a/src/libcmd/command.cc b/src/libcmd/command.cc
index 6b6bbe345..b06d40902 100644
--- a/src/libcmd/command.cc
+++ b/src/libcmd/command.cc
@@ -2,6 +2,7 @@
 #include <nlohmann/json.hpp>
 
 #include "nix/cmd/command.hh"
+#include "nix/cmd/legacy.hh"
 #include "nix/cmd/markdown.hh"
 #include "nix/store/store-open.hh"
 #include "nix/store/local-fs-store.hh"
@@ -14,6 +15,18 @@
 
 namespace nix {
 
+RegisterCommand::Commands & RegisterCommand::commands()
+{
+    static RegisterCommand::Commands commands;
+    return commands;
+}
+
+RegisterLegacyCommand::Commands & RegisterLegacyCommand::commands()
+{
+    static RegisterLegacyCommand::Commands commands;
+    return commands;
+}
+
 nix::Commands RegisterCommand::getCommandsFor(const std::vector<std::string> & prefix)
 {
     nix::Commands res;
diff --git a/src/libcmd/include/nix/cmd/command.hh b/src/libcmd/include/nix/cmd/command.hh
index 20cd1abc1..37046b885 100644
--- a/src/libcmd/include/nix/cmd/command.hh
+++ b/src/libcmd/include/nix/cmd/command.hh
@@ -286,11 +286,7 @@ struct RegisterCommand
 {
     typedef std::map<std::vector<std::string>, std::function<ref<Command>()>> Commands;
 
-    static Commands & commands()
-    {
-        static Commands commands;
-        return commands;
-    }
+    static Commands & commands();
 
     RegisterCommand(std::vector<std::string> && name, std::function<ref<Command>()> command)
     {
diff --git a/src/libcmd/include/nix/cmd/legacy.hh b/src/libcmd/include/nix/cmd/legacy.hh
index 546057184..d408cde7a 100644
--- a/src/libcmd/include/nix/cmd/legacy.hh
+++ b/src/libcmd/include/nix/cmd/legacy.hh
@@ -13,11 +13,7 @@ struct RegisterLegacyCommand
 {
     typedef std::map<std::string, MainFunction> Commands;
 
-    static Commands & commands()
-    {
-        static Commands commands;
-        return commands;
-    }
+    static Commands & commands();
 
     RegisterLegacyCommand(const std::string & name, MainFunction fun)
     {
diff --git a/src/libexpr/include/nix/expr/primops.hh b/src/libexpr/include/nix/expr/primops.hh
index 6407ba84e..8854f6b03 100644
--- a/src/libexpr/include/nix/expr/primops.hh
+++ b/src/libexpr/include/nix/expr/primops.hh
@@ -12,11 +12,7 @@ struct RegisterPrimOp
 {
     typedef std::vector<PrimOp> PrimOps;
 
-    static PrimOps & primOps()
-    {
-        static PrimOps primOps;
-        return primOps;
-    }
+    static PrimOps & primOps();
 
     /**
      * You can register a constant by passing an arity of 0. fun
diff --git a/src/libexpr/include/nix/expr/print-options.hh b/src/libexpr/include/nix/expr/print-options.hh
index ffb80abc3..600b96ba2 100644
--- a/src/libexpr/include/nix/expr/print-options.hh
+++ b/src/libexpr/include/nix/expr/print-options.hh
@@ -110,7 +110,7 @@ struct PrintOptions
  * `PrintOptions` for unknown and therefore potentially large values in error messages,
  * to avoid printing "too much" output.
  */
-static PrintOptions errorPrintOptions = PrintOptions{
+static constexpr PrintOptions errorPrintOptions = PrintOptions{
     .ansiColors = true,
     .maxDepth = 10,
     .maxAttrs = 10,
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 2526ff5e1..52bd865b7 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -39,6 +39,12 @@
 
 namespace nix {
 
+RegisterPrimOp::PrimOps & RegisterPrimOp::primOps()
+{
+    static RegisterPrimOp::PrimOps primOps;
+    return primOps;
+}
+
 /*************************************************************
  * Miscellaneous
  *************************************************************/
diff --git a/src/libstore/builtins/buildenv.cc b/src/libstore/builtins/buildenv.cc
index 22ed8d807..4db37d43a 100644
--- a/src/libstore/builtins/buildenv.cc
+++ b/src/libstore/builtins/buildenv.cc
@@ -10,6 +10,12 @@
 
 namespace nix {
 
+RegisterBuiltinBuilder::BuiltinBuilders & RegisterBuiltinBuilder::builtinBuilders()
+{
+    static RegisterBuiltinBuilder::BuiltinBuilders builders;
+    return builders;
+}
+
 namespace {
 
 struct State
diff --git a/src/libstore/include/nix/store/builtins.hh b/src/libstore/include/nix/store/builtins.hh
index cc164fe82..8d450de97 100644
--- a/src/libstore/include/nix/store/builtins.hh
+++ b/src/libstore/include/nix/store/builtins.hh
@@ -20,11 +20,7 @@ struct RegisterBuiltinBuilder
 {
     typedef std::map<std::string, BuiltinBuilder> BuiltinBuilders;
 
-    static BuiltinBuilders & builtinBuilders()
-    {
-        static BuiltinBuilders builders;
-        return builders;
-    }
+    static BuiltinBuilders & builtinBuilders();
 
     RegisterBuiltinBuilder(const std::string & name, BuiltinBuilder && fun)
     {
diff --git a/src/libutil/config-global.cc b/src/libutil/config-global.cc
index cd461ea48..b63b4aaa1 100644
--- a/src/libutil/config-global.cc
+++ b/src/libutil/config-global.cc
@@ -4,6 +4,12 @@
 
 namespace nix {
 
+GlobalConfig::ConfigRegistrations & GlobalConfig::configRegistrations()
+{
+    static GlobalConfig::ConfigRegistrations configRegistrations;
+    return configRegistrations;
+}
+
 bool GlobalConfig::set(const std::string & name, const std::string & value)
 {
     for (auto & config : configRegistrations())
diff --git a/src/libutil/include/nix/util/config-global.hh b/src/libutil/include/nix/util/config-global.hh
index 0e6f43ec4..5074351e0 100644
--- a/src/libutil/include/nix/util/config-global.hh
+++ b/src/libutil/include/nix/util/config-global.hh
@@ -9,11 +9,7 @@ struct GlobalConfig : public AbstractConfig
 {
     typedef std::vector<Config *> ConfigRegistrations;
 
-    static ConfigRegistrations & configRegistrations()
-    {
-        static ConfigRegistrations configRegistrations;
-        return configRegistrations;
-    }
+    static ConfigRegistrations & configRegistrations();
 
     bool set(const std::string & name, const std::string & value) override;