diff --git a/addons/medical_gui/stringtable.xml b/addons/medical_gui/stringtable.xml
index d1663ea0cc..64b57e7bc7 100644
--- a/addons/medical_gui/stringtable.xml
+++ b/addons/medical_gui/stringtable.xml
@@ -869,9 +869,7 @@
             <Chinese>已使用固定板</Chinese>
             <Czech>Dlaha aplikována</Czech>
         </Key>
-        <!--
-            Strings above match Blood2 but seem to differ in some languages, determine which is best to use
-        -->
+        <!--Strings above match Blood2 but seem to differ in some languages, determine which is best to use-->
         <Key ID="STR_ACE_Medical_GUI_Lost_Blood1">
             <English>Lost some blood</English>
             <German>Hat etwas Blut verloren</German>
diff --git a/tools/stringtable_validator.py b/tools/stringtable_validator.py
index 7df6105394..5252297f56 100644
--- a/tools/stringtable_validator.py
+++ b/tools/stringtable_validator.py
@@ -115,6 +115,29 @@ def check_stringtable(filepath):
                 print("  ERROR: Key '{}' is defined {} times.".format(id, count))
                 errors += 1
 
+    # Check whitespace for tabs and correct number of indenting spaces
+    with open(filepath, "r", encoding = "utf-8") as file:
+       spacing_depth = 0
+
+       for line_number, line in enumerate(file, 1):
+           if "\t" in line:
+               print("  ERROR: Found a tab on line {}.".format(line_number))
+               errors += 1
+
+           line_clean = line.lstrip().lower()
+
+           if line_clean.startswith("</key") or line_clean.startswith("</package") or line_clean.startswith("</project") or line_clean.startswith("</container"):
+               spacing_depth -= 4
+
+           line_spacing = len(line) - len(line_clean)
+
+           if line_spacing != spacing_depth:
+               print("  ERROR: Incorrect number of indenting spaces on line {}, currently {}, should be {}.".format(line_number, line_spacing, spacing_depth))
+               errors += 1
+
+           if line_clean.startswith("<key") or line_clean.startswith("<package") or line_clean.startswith("<project") or line_clean.startswith("<container"):
+               spacing_depth += 4
+
     return errors