diff --git a/frontend/src/utils/index.ts b/frontend/src/utils/index.ts
index d85c7f3ff3b966fe094f9bb1c21e8a35856c1bd5..90854e450499987ff83b45959015cbf070b5ad7c 100644
--- a/frontend/src/utils/index.ts
+++ b/frontend/src/utils/index.ts
@@ -125,6 +125,7 @@ function stringContainsIllegalChars(string: string): boolean {
   // Only allow the following characters:
   // ----- Basic Latin -----
   // U+0020 (Space)
+  // U+002D (Hyphen-minus)
   // U+0041 - U+005A (Latin Alphabet: Uppercase)
   // U+0061 - U+007A (Latin Alphabet: Lowercase)
   // ----- Latin-1 Supplement -----
@@ -136,7 +137,7 @@ function stringContainsIllegalChars(string: string): boolean {
   // U+0100 - U+017F (European Latin)
 
   // eslint-disable-next-line no-control-regex
-  return /[^\u0020\u0041-\u005A\u0061-\u007A\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u017F]/g.test(
+  return /[^\u0020\u002D\u0041-\u005A\u0061-\u007A\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u017F]/g.test(
     string
   )
 }
diff --git a/greg/utils.py b/greg/utils.py
index b60d9b948709f913495c86f63fc321e921b0f38f..63e17472a7a7b5fa6cb4af6f9dbc4d4e1ff96ef8 100644
--- a/greg/utils.py
+++ b/greg/utils.py
@@ -226,6 +226,7 @@ def string_contains_illegal_chars(string: str) -> bool:
     # Only allow the following characters:
     # ----- Basic Latin -----
     # U+0020 (Space)
+    # U+002D (Hyphen-minus)
     # U+0041 - U+005A (Latin Alphabet: Uppercase)
     # U+0061 - U+007A (Latin Alphabet: Lowercase)
     # ----- Latin-1 Supplement -----
@@ -237,7 +238,7 @@ def string_contains_illegal_chars(string: str) -> bool:
     # U+0100 - U+017F (European Latin)
     return bool(
         re.search(
-            r"[^\u0020\u0041-\u005A\u0061-\u007A\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u017F]",
+            r"[^\u0020\u002D\u0041-\u005A\u0061-\u007A\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u017F]",
             string,
         )
     )