diff --git a/src/libappimage/utils/StringSanitizer.cpp b/src/libappimage/utils/StringSanitizer.cpp
index fee9f7d..521d82e 100644
--- a/src/libappimage/utils/StringSanitizer.cpp
+++ b/src/libappimage/utils/StringSanitizer.cpp
@@ -13,6 +13,20 @@ std::string StringSanitizer::sanitizeForPath() {
     std::vector<std::string::value_type> buffer{};
     buffer.reserve(input_.size());
 
+    // these three lists can be used to compose alphabets for sanitization
+    static constexpr std::initializer_list<std::string::value_type> asciiLetters_ = {
+        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
+        'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
+        'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+    };
+    static constexpr std::initializer_list<std::string::value_type> asciiDigits_ = {
+        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+    };
+    static constexpr std::initializer_list<std::string::value_type> pathSafeChars_ = {
+        '.', '-', '_'
+    };
+
     // first of all, we compose an alphabet of safe characters
     // all characters not contained in this alphabet will be replaced by some safe character, e.g., an underscore (_)
     std::vector<std::string::value_type> safeAlphabet{asciiDigits_.size() + asciiLetters_.size() + pathSafeChars_.size()};
diff --git a/src/libappimage/utils/StringSanitizer.h b/src/libappimage/utils/StringSanitizer.h
index 5301ec1..9919ed6 100644
--- a/src/libappimage/utils/StringSanitizer.h
+++ b/src/libappimage/utils/StringSanitizer.h
@@ -10,20 +10,6 @@ class StringSanitizer {
 private:
     std::string input_;
 
-    // these three lists can be used to compose alphabets for sanitization
-    static constexpr std::initializer_list<std::string::value_type> asciiLetters_ = {
-        'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
-        'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
-        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
-        'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
-    };
-    static constexpr std::initializer_list<std::string::value_type> asciiDigits_ = {
-        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
-    };
-    static constexpr std::initializer_list<std::string::value_type> pathSafeChars_ = {
-        '.', '-', '_'
-    };
-
 public:
     /**
      * Default constructor.