diff --git a/src/main/java/ninja/Aws4HashCalculator.java b/src/main/java/ninja/Aws4HashCalculator.java
index 30505df..ad06329 100644
--- a/src/main/java/ninja/Aws4HashCalculator.java
+++ b/src/main/java/ninja/Aws4HashCalculator.java
@@ -118,7 +118,7 @@ private String buildStringToSign(final WebContext ctx,
     private StringBuilder buildCanonicalRequest(final WebContext ctx, final String signedHeaders) {
         StringBuilder canonicalRequest = new StringBuilder(ctx.getRequest().method().name());
         canonicalRequest.append("\n");
-        canonicalRequest.append(ctx.getRequestedURI());
+        canonicalRequest.append(ctx.getRawRequestedURI());
         canonicalRequest.append("\n");
 
         appendCanonicalQueryString(ctx, canonicalRequest);