diff --git a/java/org/apache/jasper/compiler/JDTCompiler.java b/java/org/apache/jasper/compiler/JDTCompiler.java
index ebc00f6..df22856 100644
--- a/java/org/apache/jasper/compiler/JDTCompiler.java
+++ b/java/org/apache/jasper/compiler/JDTCompiler.java
@@ -306,9 +306,9 @@ public class JDTCompiler extends org.apache.jasper.compiler.Compiler {
             } else if(opt.equals("13")) {
                 settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_13);
             } else if(opt.equals("14")) {
-                settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_14);
+                settings.put(CompilerOptions.OPTION_Source, "14");
             } else if(opt.equals("15")) {
-                settings.put(CompilerOptions.OPTION_Source, CompilerOptions.VERSION_15);
+                settings.put(CompilerOptions.OPTION_Source, "15");
             } else if(opt.equals("16")) {
                 // Constant not available in latest ECJ version shipped with
                 // Tomcat. May be supported in a snapshot build.
@@ -364,11 +364,11 @@ public class JDTCompiler extends org.apache.jasper.compiler.Compiler {
                 settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_13);
                 settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_13);
             } else if(opt.equals("14")) {
-                settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_14);
-                settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_14);
+                settings.put(CompilerOptions.OPTION_TargetPlatform, "14");
+                settings.put(CompilerOptions.OPTION_Compliance, "14");
             } else if(opt.equals("15")) {
-                settings.put(CompilerOptions.OPTION_TargetPlatform, CompilerOptions.VERSION_15);
-                settings.put(CompilerOptions.OPTION_Compliance, CompilerOptions.VERSION_15);
+                settings.put(CompilerOptions.OPTION_TargetPlatform, "15");
+                settings.put(CompilerOptions.OPTION_Compliance, "15");
             } else if(opt.equals("16")) {
                 // Constant not available in latest ECJ version shipped with
                 // Tomcat. May be supported in a snapshot build.