diff --git a/src/main/java/io/gitlab/jfronny/respackopts/Respackopts.java b/src/main/java/io/gitlab/jfronny/respackopts/Respackopts.java
index 441a099..180e719 100644
--- a/src/main/java/io/gitlab/jfronny/respackopts/Respackopts.java
+++ b/src/main/java/io/gitlab/jfronny/respackopts/Respackopts.java
@@ -94,4 +94,16 @@ public class Respackopts implements ClientModInitializer {
             }
         }
     }
+
+    public static String sanitizeString(String s) {
+        // This trims whitespace/underscores and removes non-alphabetical or underscore characters
+
+        // ^ = start of string
+        // $ = end of string
+        // * = zero or more times
+        // [\\s_] = whitespace or underscores
+        // | = or
+        // [^a-zA-Z_] = not character or underscore
+        return s.replaceAll("[^a-zA-Z_]|^[\\s_]*|[\\s_]*$", "");
+    }
 }
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/data/entry/ConfigBranch.java b/src/main/java/io/gitlab/jfronny/respackopts/data/entry/ConfigBranch.java
index 3fe2807..96e8698 100644
--- a/src/main/java/io/gitlab/jfronny/respackopts/data/entry/ConfigBranch.java
+++ b/src/main/java/io/gitlab/jfronny/respackopts/data/entry/ConfigBranch.java
@@ -83,7 +83,7 @@ public class ConfigBranch extends ConfigEntry<Map<String, ConfigEntry<?>>> {
     @Override
     public void buildShader(StringBuilder sb, String valueName) {
         for (Map.Entry<String, ConfigEntry<?>> e : super.getValue().entrySet()) {
-            e.getValue().buildShader(sb, valueName + "_" + e.getKey());
+            e.getValue().buildShader(sb, valueName + "_" + Respackopts.sanitizeString(e.getKey()));
         }
     }
 
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/data/entry/ConfigEnumEntry.java b/src/main/java/io/gitlab/jfronny/respackopts/data/entry/ConfigEnumEntry.java
index 4d0e132..bc0eca3 100644
--- a/src/main/java/io/gitlab/jfronny/respackopts/data/entry/ConfigEnumEntry.java
+++ b/src/main/java/io/gitlab/jfronny/respackopts/data/entry/ConfigEnumEntry.java
@@ -92,7 +92,7 @@ public class ConfigEnumEntry extends ConfigEntry<String> {
         sb.append(' ');
         sb.append(values.indexOf(getValue()));
         for (int i = 0; i < values.size(); i++) {
-            String e2 = values.get(i);
+            String e2 = Respackopts.sanitizeString(values.get(i));
             if (version == 1) {
                 sb.append("\n#define ");
                 sb.append(valueName);
diff --git a/src/main/java/io/gitlab/jfronny/respackopts/integration/FrexCompat.java b/src/main/java/io/gitlab/jfronny/respackopts/integration/FrexCompat.java
index ad83561..c2c9e7b 100644
--- a/src/main/java/io/gitlab/jfronny/respackopts/integration/FrexCompat.java
+++ b/src/main/java/io/gitlab/jfronny/respackopts/integration/FrexCompat.java
@@ -15,7 +15,7 @@ public class FrexCompat implements FrexInitializer {
         ShaderConfig.registerShaderConfigSupplier(new Identifier(Respackopts.ID, "config_supplier"), () -> {
             StringBuilder sb = new StringBuilder();
             for (Map.Entry<String, ConfigBranch> e : Respackopts.CONFIG_BRANCH.entrySet()) {
-                e.getValue().buildShader(sb, e.getKey());
+                e.getValue().buildShader(sb, Respackopts.sanitizeString(e.getKey()));
             }
             sb.append("\n#define respackopts_loaded");
             return sb.toString();