diff --git a/src/display/api.js b/src/display/api.js
index af6831942..deaf7d4af 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -1763,12 +1763,9 @@ class WorkerTransport {
       fullReader.headersReady.then(() => {
         // If stream or range are disabled, it's our only way to report
         // loading progress.
-        if (!fullReader.isStreamingSupported ||
-            !fullReader.isRangeSupported) {
-          if (this._lastProgress) {
-            if (loadingTask.onProgress) {
-              loadingTask.onProgress(this._lastProgress);
-            }
+        if (!fullReader.isStreamingSupported || !fullReader.isRangeSupported) {
+          if (this._lastProgress && loadingTask.onProgress) {
+            loadingTask.onProgress(this._lastProgress);
           }
           fullReader.onProgress = (evt) => {
             if (loadingTask.onProgress) {
@@ -1866,6 +1863,14 @@ class WorkerTransport {
     }, this);
 
     messageHandler.on('DataLoaded', function(data) {
+      // For consistency: Ensure that progress is always reported when the
+      // entire PDF file has been loaded, regardless of how it was fetched.
+      if (loadingTask.onProgress) {
+        loadingTask.onProgress({
+          loaded: data.length,
+          total: data.length,
+        });
+      }
       this.downloadInfoCapability.resolve(data);
     }, this);
 
diff --git a/test/unit/api_spec.js b/test/unit/api_spec.js
index ebdc3d6d5..42a287263 100644
--- a/test/unit/api_spec.js
+++ b/test/unit/api_spec.js
@@ -142,9 +142,20 @@ describe('api', function() {
       // Sanity check to make sure that we fetched the entire PDF file.
       expect(typedArrayPdf.length).toEqual(basicApiFileLength);
 
-      var loadingTask = getDocument(typedArrayPdf);
-      loadingTask.promise.then(function(data) {
-        expect(data instanceof PDFDocumentProxy).toEqual(true);
+      const loadingTask = getDocument(typedArrayPdf);
+
+      const progressReportedCapability = createPromiseCapability();
+      loadingTask.onProgress = function(data) {
+        progressReportedCapability.resolve(data);
+      };
+
+      Promise.all([
+        loadingTask.promise,
+        progressReportedCapability.promise,
+      ]).then(function(data) {
+        expect(data[0] instanceof PDFDocumentProxy).toEqual(true);
+        expect(data[1].loaded / data[1].total).toEqual(1);
+
         loadingTask.destroy().then(done);
       }).catch(done.fail);
     });