diff --git a/src/ipmiblob/internal/sys.cpp b/src/ipmiblob/internal/sys.cpp
index 46c6642..71cd182 100644
--- a/src/ipmiblob/internal/sys.cpp
+++ b/src/ipmiblob/internal/sys.cpp
@@ -21,6 +21,8 @@
 #include <sys/mman.h>
 #include <unistd.h>
 
+namespace ipmiblob
+{
 namespace internal
 {
 
@@ -68,3 +70,4 @@
 SysImpl sys_impl;
 
 } // namespace internal
+} // namespace ipmiblob
diff --git a/src/ipmiblob/internal/sys.hpp b/src/ipmiblob/internal/sys.hpp
index 2975b8c..ba9bcbe 100644
--- a/src/ipmiblob/internal/sys.hpp
+++ b/src/ipmiblob/internal/sys.hpp
@@ -13,6 +13,8 @@
 #include <cinttypes>
 #include <cstddef>
 
+namespace ipmiblob
+{
 namespace internal
 {
 
@@ -59,3 +61,4 @@
 extern SysImpl sys_impl;
 
 } // namespace internal
+} // namespace ipmiblob
diff --git a/test/internal_sys_mock.hpp b/test/internal_sys_mock.hpp
index b4ba4b1..2fe0c58 100644
--- a/test/internal_sys_mock.hpp
+++ b/test/internal_sys_mock.hpp
@@ -6,6 +6,8 @@
 
 #include <gmock/gmock.h>
 
+namespace ipmiblob
+{
 namespace internal
 {
 
@@ -25,3 +27,4 @@
 };
 
 } // namespace internal
+} // namespace ipmiblob