diff --git a/application/argumentparser.cpp b/application/argumentparser.cpp
index 2928ea3..df7a543 100644
--- a/application/argumentparser.cpp
+++ b/application/argumentparser.cpp
@@ -32,27 +32,6 @@ using namespace CppUtilities::EscapeCodes;
  */
 namespace CppUtilities {
 
-/*!
- * \brief Returns whether the specified env variable is set to a non-zero and non-white-space-only value.
- */
-std::optional<bool> isEnvVariableSet(const char *variableName)
-{
-    const char *envValue = std::getenv(variableName);
-    if (!envValue) {
-        return std::nullopt;
-    }
-    for (; *envValue; ++envValue) {
-        switch (*envValue) {
-        case '0':
-        case ' ':
-            break;
-        default:
-            return true;
-        }
-    }
-    return false;
-}
-
 /*!
  * \brief The ArgumentDenotationType enum specifies the type of a given argument denotation.
  */
diff --git a/application/argumentparserprivate.h b/application/argumentparserprivate.h
index 0725135..6a24bb7 100644
--- a/application/argumentparserprivate.h
+++ b/application/argumentparserprivate.h
@@ -4,8 +4,6 @@
 #include "./argumentparser.h"
 #include "./commandlineutils.h"
 
-#include <optional>
-
 namespace CppUtilities {
 
 class CPP_UTILITIES_EXPORT ArgumentReader {
@@ -58,8 +56,6 @@ inline Wrapper::Wrapper(const char *str, Indentation currentIndentation)
 {
 }
 
-std::optional<bool> isEnvVariableSet(const char *variableName);
-
 } // namespace CppUtilities
 
 #endif // APPLICATION_UTILITIES_ARGUMENTPARSER_PRIVATE_H
diff --git a/application/commandlineutils.cpp b/application/commandlineutils.cpp
index 331ab74..13eeffe 100644
--- a/application/commandlineutils.cpp
+++ b/application/commandlineutils.cpp
@@ -43,6 +43,27 @@ bool confirmPrompt(const char *message, Response defaultResponse)
     }
 }
 
+/*!
+ * \brief Returns whether the specified env variable is set to a non-zero and non-white-space-only value.
+ */
+std::optional<bool> isEnvVariableSet(const char *variableName)
+{
+    const char *envValue = std::getenv(variableName);
+    if (!envValue) {
+        return std::nullopt;
+    }
+    for (; *envValue; ++envValue) {
+        switch (*envValue) {
+        case '0':
+        case ' ':
+            break;
+        default:
+            return true;
+        }
+    }
+    return false;
+}
+
 /*!
  * \brief Returns the current size of the terminal.
  * \remarks Unknown members of the returned TerminalSize are set to zero.
diff --git a/application/commandlineutils.h b/application/commandlineutils.h
index f47b92d..6b0d680 100644
--- a/application/commandlineutils.h
+++ b/application/commandlineutils.h
@@ -3,6 +3,7 @@
 
 #include "../global.h"
 
+#include <optional>
 #include <ostream>
 
 #ifdef PLATFORM_WINDOWS
@@ -18,6 +19,7 @@ namespace CppUtilities {
 enum class Response { None, Yes, No };
 
 CPP_UTILITIES_EXPORT bool confirmPrompt(const char *message, Response defaultResponse = Response::None);
+CPP_UTILITIES_EXPORT std::optional<bool> isEnvVariableSet(const char *variableName);
 
 #ifdef PLATFORM_WINDOWS
 CPP_UTILITIES_EXPORT bool handleVirtualTerminalProcessing();