diff --git a/app/src/main/cpp/CoreWrapper.cpp b/app/src/main/cpp/CoreWrapper.cpp
index 80173c6ea84b..90195a833c10 100644
--- a/app/src/main/cpp/CoreWrapper.cpp
+++ b/app/src/main/cpp/CoreWrapper.cpp
@@ -68,6 +68,9 @@ Java_at_tomtasche_reader_background_CoreWrapper_parseNative(JNIEnv *env, jobject
         jfieldID txtField = env->GetFieldID(optionsClass, "txt", "Z");
         jboolean txt = env->GetBooleanField(options, txtField);
 
+        jfieldID pdfField = env->GetFieldID(optionsClass, "pdf", "Z");
+        jboolean pdf = env->GetBooleanField(options, pdfField);
+
         jfieldID pagingField = env->GetFieldID(optionsClass, "paging", "Z");
         jboolean paging = env->GetBooleanField(options, pagingField);
 
@@ -112,6 +115,11 @@ Java_at_tomtasche_reader_background_CoreWrapper_parseNative(JNIEnv *env, jobject
                 return result;
             }
 
+            if (!pdf && file.file_type() == odr::FileType::portable_document_format) {
+                env->SetIntField(result, errorField, -5);
+                return result;
+            }
+
             odr::HtmlConfig config;
             config.editable = editable;
 
diff --git a/app/src/main/java/at/tomtasche/reader/background/CoreWrapper.java b/app/src/main/java/at/tomtasche/reader/background/CoreWrapper.java
index bcecd270203a..cbd4b319151c 100644
--- a/app/src/main/java/at/tomtasche/reader/background/CoreWrapper.java
+++ b/app/src/main/java/at/tomtasche/reader/background/CoreWrapper.java
@@ -82,6 +82,7 @@ public static class CoreOptions {
 
         public boolean ooxml;
         public boolean txt;
+        public boolean pdf;
 
         public boolean editable;
 
diff --git a/app/src/main/java/at/tomtasche/reader/background/RawLoader.java b/app/src/main/java/at/tomtasche/reader/background/RawLoader.java
index fcdf16dcaab5..aabc843813a1 100644
--- a/app/src/main/java/at/tomtasche/reader/background/RawLoader.java
+++ b/app/src/main/java/at/tomtasche/reader/background/RawLoader.java
@@ -140,7 +140,9 @@ public void loadSync(Options options) {
                 CoreWrapper.CoreOptions coreOptions = new CoreWrapper.CoreOptions();
                 coreOptions.inputPath = cacheFile.getPath();
                 coreOptions.outputPath = cacheDirectory.getPath();
+                coreOptions.ooxml = false;
                 coreOptions.txt = true;
+                coreOptions.pdf = false;
 
                 lastCoreOptions = coreOptions;