diff --git a/aws-serverless-java-container-core/src/main/java/com/amazonaws/serverless/proxy/internal/SecurityUtils.java b/aws-serverless-java-container-core/src/main/java/com/amazonaws/serverless/proxy/internal/SecurityUtils.java
index d553d17a7..0023104a7 100644
--- a/aws-serverless-java-container-core/src/main/java/com/amazonaws/serverless/proxy/internal/SecurityUtils.java
+++ b/aws-serverless-java-container-core/src/main/java/com/amazonaws/serverless/proxy/internal/SecurityUtils.java
@@ -201,7 +201,7 @@ public static String getValidFilePath(final String inputPath, boolean isWrite) {
         try {
             String canonicalPath = f.getCanonicalPath();
 
-            if (isWrite && canonicalPath.startsWith("/var/task")) {
+            if (isWrite && f.getCanonicalFile().toPath().startsWith("/var/task")) {
                 throw new IllegalArgumentException("Trying to write to /var/task folder");
             }