diff --git a/user/super/com/google/gwt/emul/java/lang/Enum.java b/user/super/com/google/gwt/emul/java/lang/Enum.java
index 43a00b9..13d0114 100644
--- a/user/super/com/google/gwt/emul/java/lang/Enum.java
+++ b/user/super/com/google/gwt/emul/java/lang/Enum.java
@@ -19,9 +19,7 @@
 import static javaemul.internal.InternalPreconditions.checkNotNull;
 
 import com.google.gwt.core.client.JavaScriptObject;
-
 import java.io.Serializable;
-
 import jsinterop.annotations.JsIgnore;
 import jsinterop.annotations.JsNonNull;
 import jsinterop.annotations.JsType;
@@ -55,7 +53,7 @@
     checkNotNull(name);
 
     T result = Enum.<T> get0(map, ":" + name);
-    checkCriticalArgument(result != null, "Enum constant undefined: %s", name);
+    checkCriticalArgument(result != null, "Enum constant undefined: " + name);
     return result;
   }
 
diff --git a/user/super/com/google/gwt/emul/java/util/Arrays.java b/user/super/com/google/gwt/emul/java/util/Arrays.java
index 7af525f..3ddb92a 100644
--- a/user/super/com/google/gwt/emul/java/util/Arrays.java
+++ b/user/super/com/google/gwt/emul/java/util/Arrays.java
@@ -606,7 +606,7 @@
   }
 
   private static void checkCopyOfRange(Object original, int from, int to) {
-    checkArgument(from <= to, "%s > %s", from, to);
+    checkArgument(from <= to, from + " > " + to);
     int len = ArrayHelper.getLength(original);
     checkCriticalArrayBounds(from, from, len);
   }
diff --git a/user/super/com/google/gwt/emul/java/util/EnumSet.java b/user/super/com/google/gwt/emul/java/util/EnumSet.java
index 7399e3a..e3594ef 100644
--- a/user/super/com/google/gwt/emul/java/util/EnumSet.java
+++ b/user/super/com/google/gwt/emul/java/util/EnumSet.java
@@ -232,7 +232,7 @@
   }
 
   public static <E extends Enum<E>> EnumSet<E> range(E from, E to) {
-    checkArgument(from.compareTo(to) <= 0, "%s > %s", from, to);
+    checkArgument(from.compareTo(to) <= 0, from + " > " + to);
 
     E[] all = from.getDeclaringClass().getEnumConstants();
     E[] set = ArrayHelper.createFrom(all, all.length);
diff --git a/user/super/com/google/gwt/emul/javaemul/internal/InternalPreconditions.java b/user/super/com/google/gwt/emul/javaemul/internal/InternalPreconditions.java
index a66c330..f41d857 100644
--- a/user/super/com/google/gwt/emul/javaemul/internal/InternalPreconditions.java
+++ b/user/super/com/google/gwt/emul/javaemul/internal/InternalPreconditions.java
@@ -324,35 +324,6 @@
   }
 
   /**
-   * Ensures the truth of an expression involving one or more parameters to the calling method.
-   */
-  public static void checkArgument(boolean expression, String errorMessageTemplate,
-      Object... errorMessageArgs) {
-    if (IS_API_CHECKED) {
-      checkCriticalArgument(expression, errorMessageTemplate, errorMessageArgs);
-    } else if (IS_ASSERTED) {
-      try {
-        checkCriticalArgument(expression, errorMessageTemplate, errorMessageArgs);
-      } catch (Exception e) {
-        throw new AssertionError(e);
-      }
-    }
-  }
-
-  /**
-   * Ensures the truth of an expression involving one or more parameters to the calling method.
-   * <p>
-   * For cases where failing fast is pretty important and not failing early could cause bugs that
-   * are much harder to debug.
-   */
-  public static void checkCriticalArgument(boolean expression, String errorMessageTemplate,
-      Object... errorMessageArgs) {
-    if (!expression) {
-      throw new IllegalArgumentException(format(errorMessageTemplate, errorMessageArgs));
-    }
-  }
-
-  /**
    * Ensures the truth of an expression involving the state of the calling instance, but not
    * involving any parameters to the calling method.
    *
@@ -615,44 +586,6 @@
     }
   }
 
-  /**
-   * Substitutes each {@code %s} in {@code template} with an argument. These are matched by
-   * position: the first {@code %s} gets {@code args[0]}, etc.  If there are more arguments than
-   * placeholders, the unmatched arguments will be appended to the end of the formatted message in
-   * square braces.
-   */
-  private static String format(String template, Object... args) {
-    template = String.valueOf(template); // null -> "null"
-
-    // start substituting the arguments into the '%s' placeholders
-    StringBuilder builder = new StringBuilder(template.length() + 16 * args.length);
-    int templateStart = 0;
-    int i = 0;
-    while (i < args.length) {
-      int placeholderStart = template.indexOf("%s", templateStart);
-      if (placeholderStart == -1) {
-        break;
-      }
-      builder.append(template.substring(templateStart, placeholderStart));
-      builder.append(args[i++]);
-      templateStart = placeholderStart + 2;
-    }
-    builder.append(template.substring(templateStart));
-
-    // if we run out of placeholders, append the extra args in square braces
-    if (i < args.length) {
-      builder.append(" [");
-      builder.append(args[i++]);
-      while (i < args.length) {
-        builder.append(", ");
-        builder.append(args[i++]);
-      }
-      builder.append(']');
-    }
-
-    return builder.toString();
-  }
-
   // Hides the constructor for this static utility class.
   private InternalPreconditions() { }
 }