diff --git a/app/cli-acx/src/main/java/io/github/applecommander/acx/converter/IntegerTypeConverter.java b/app/cli-acx/src/main/java/io/github/applecommander/acx/converter/IntegerTypeConverter.java
index 347a2a3..dcd2273 100644
--- a/app/cli-acx/src/main/java/io/github/applecommander/acx/converter/IntegerTypeConverter.java
+++ b/app/cli-acx/src/main/java/io/github/applecommander/acx/converter/IntegerTypeConverter.java
@@ -19,20 +19,29 @@
  */
 package io.github.applecommander.acx.converter;
 
+import com.webcodepro.applecommander.util.Host;
 import picocli.CommandLine.ITypeConverter;
 
 /** Add support for "$801" and "0x801" instead of just decimal like 2049. */
 public class IntegerTypeConverter implements ITypeConverter<Integer> {
 	@Override
 	public Integer convert(String value) {
-		if (value == null) {
-			return null;
-		} else if (value.startsWith("$")) {
-			return Integer.valueOf(value.substring(1), 16);
-		} else if (value.startsWith("0x") || value.startsWith("0X")) {
-			return Integer.valueOf(value.substring(2), 16);
-		} else {
-			return Integer.valueOf(value);
+		try {
+			if (value == null) {
+				return null;
+			} else if (value.startsWith("$")) {
+				return Integer.valueOf(value.substring(1), 16);
+			} else if (value.startsWith("0x") || value.startsWith("0X")) {
+				return Integer.valueOf(value.substring(2), 16);
+			} else {
+				return Integer.valueOf(value);
+			}
+		} catch (NumberFormatException ex) {
+			String msg = ex.getMessage();
+			if (Host.isLinux() || Host.isMacosx()) {
+				msg += " (check shell quoting if using '$')";
+			}
+			throw new NumberFormatException(msg);
 		}
 	}
 }
\ No newline at end of file