diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index 7b679bf2..2df7ff82 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -3,6 +3,7 @@ add_executable( exiv2
      exiv2app.hpp
      actions.cpp actions.hpp
      getopt.cpp getopt.hpp
+     app_utils.cpp app_utils.hpp
     $<TARGET_OBJECTS:exiv2lib_int>
 )
 
diff --git a/app/actions.cpp b/app/actions.cpp
index a58d467f..d1f601ae 100644
--- a/app/actions.cpp
+++ b/app/actions.cpp
@@ -24,8 +24,10 @@
 // included header files
 #include "config.h"
 
+#include "app_utils.hpp"
 #include "actions.hpp"
 #include "exiv2app.hpp"
+
 #include "image.hpp"
 #include "jpgimage.hpp"
 #include "xmpsidecar.hpp"
diff --git a/app/app_utils.cpp b/app/app_utils.cpp
new file mode 100644
index 00000000..dec2955c
--- /dev/null
+++ b/app/app_utils.cpp
@@ -0,0 +1,22 @@
+#include "utils.hpp"
+
+#include <cstdlib>
+#include <climits>
+
+namespace Util
+{
+    bool strtol(const char* nptr, long& n)
+    {
+        if (!nptr || *nptr == '\0')
+            return false;
+        char* endptr = nullptr;
+        long tmp = std::strtol(nptr, &endptr, 10);
+        if (*endptr != '\0')
+            return false;
+        if (tmp == LONG_MAX || tmp == LONG_MIN)
+            return false;
+        n = tmp;
+        return true;
+    }
+
+}  // namespace Util
diff --git a/app/app_utils.hpp b/app/app_utils.hpp
new file mode 100644
index 00000000..be8db686
--- /dev/null
+++ b/app/app_utils.hpp
@@ -0,0 +1,13 @@
+#ifndef APP_UTILS_HPP_
+#define APP_UTILS_HPP_
+
+namespace Util {
+    /*!
+      @brief Convert a C string to a long value, which is returned in n.
+             Returns true if the conversion is successful, else false.
+             n is not modified if the conversion is unsuccessful. See strtol(2).
+     */
+    bool strtol(const char* nptr, long& n);
+}                                       // namespace Util
+
+#endif                                  // #ifndef UTILS_HPP_
diff --git a/app/exiv2.cpp b/app/exiv2.cpp
index fe97449d..87fb2f99 100644
--- a/app/exiv2.cpp
+++ b/app/exiv2.cpp
@@ -22,8 +22,10 @@
 
 // include local header files which are not part of libexiv2
 #include "actions.hpp"
-#include "convert.hpp"
+#include "app_utils.hpp"
 #include "exiv2app.hpp"
+
+#include "convert.hpp"
 #include "futils.hpp"
 #include "getopt.hpp"
 #include "i18n.h"  // NLS support.
diff --git a/src/utils.cpp b/src/utils.cpp
index 0ef0f203..72124f6a 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -98,15 +98,4 @@ namespace Util {
         return b.substr(idx);
     }
 
-    bool strtol(const char* nptr, long& n)
-    {
-        if (!nptr || *nptr == '\0') return false;
-        char* endptr = nullptr;
-        long tmp = std::strtol(nptr, &endptr, 10);
-        if (*endptr != '\0') return false;
-        if (tmp == LONG_MAX || tmp == LONG_MIN) return false;
-        n = tmp;
-        return true;
-    }
-
 }                                       // namespace Util
diff --git a/src/utils.hpp b/src/utils.hpp
index 5f63b7d5..42517a7f 100644
--- a/src/utils.hpp
+++ b/src/utils.hpp
@@ -63,13 +63,6 @@ namespace Util {
              to the end of the string.
      */
     std::string suffix(const std::string& path);
-
-    /*!
-      @brief Convert a C string to a long value, which is returned in n.
-             Returns true if the conversion is successful, else false.
-             n is not modified if the conversion is unsuccessful. See strtol(2).
-     */
-    bool strtol(const char* nptr, long& n);
 }                                       // namespace Util
 
 #endif                                  // #ifndef UTILS_HPP_