diff --git a/common/src/main/java/li/cil/tis3d/common/module/execution/compiler/Compiler.java b/common/src/main/java/li/cil/tis3d/common/module/execution/compiler/Compiler.java
index 0c615fca..997a58aa 100644
--- a/common/src/main/java/li/cil/tis3d/common/module/execution/compiler/Compiler.java
+++ b/common/src/main/java/li/cil/tis3d/common/module/execution/compiler/Compiler.java
@@ -186,7 +186,7 @@ private static void parseInstruction(final Matcher matcher, final MachineState s
     // --------------------------------------------------------------------- //
 
     private static final Pattern PATTERN_COMMENT = Pattern.compile("#.*$");
-    private static final Pattern PATTERN_DEFINE = Pattern.compile("#DEFINE\\s+(?<key>\\S+)\\s*(?<value>\\S+)\\s*$");
+    private static final Pattern PATTERN_DEFINE = Pattern.compile("(#DEF|#DEFINE)\\s+(?<key>\\S+)\\s*(?<value>\\S+)\\s*(#.*)?$");
     private static final Pattern PATTERN_UNDEFINE = Pattern.compile("#UNDEF\\s+(?<key>\\S+)\\s*$");
     private static final Pattern PATTERN_LINE = Pattern.compile("^\\s*(?:(?<label>[^:\\s]+)\\s*:\\s*)?(?:(?<name>\\S+)\\s*(?<arg1>[^,\\s]+)?\\s*,?\\s*(?<arg2>[^,\\s]+)?\\s*(?<excess>.+)?)?\\s*$");
     private static final String INSTRUCTION_NO_NAME = "NOP";