diff --git a/examples/undocumented/libshogun/streaming_vwfeatures.cpp b/examples/undocumented/libshogun/streaming_vwfeatures.cpp
index 35e4d3e2122..04698b56497 100644
--- a/examples/undocumented/libshogun/streaming_vwfeatures.cpp
+++ b/examples/undocumented/libshogun/streaming_vwfeatures.cpp
@@ -39,7 +39,6 @@ int main()
 	sgd->set_lambda(0.1);
 	sgd->train();
 
-	train_file->close();
 
 	// Now we want to test on other data
 	const char* test_file_name = "../data/fm_test_sparsereal.dat";
diff --git a/src/shogun/io/streaming/StreamingVwCacheFile.cpp b/src/shogun/io/streaming/StreamingVwCacheFile.cpp
index 22159482b37..f6586aa8ee3 100644
--- a/src/shogun/io/streaming/StreamingVwCacheFile.cpp
+++ b/src/shogun/io/streaming/StreamingVwCacheFile.cpp
@@ -24,7 +24,7 @@ CStreamingVwCacheFile::CStreamingVwCacheFile(EVwCacheType cache_type)
 	init(cache_type);
 }
 
-CStreamingVwCacheFile::CStreamingVwCacheFile(char* fname, char rw, EVwCacheType cache_type)
+CStreamingVwCacheFile::CStreamingVwCacheFile(const char* fname, char rw, EVwCacheType cache_type)
 	: CStreamingFile(fname, rw)
 {
 	init(cache_type);
diff --git a/src/shogun/io/streaming/StreamingVwCacheFile.h b/src/shogun/io/streaming/StreamingVwCacheFile.h
index 97ae1a9ba5b..505cc0321bf 100644
--- a/src/shogun/io/streaming/StreamingVwCacheFile.h
+++ b/src/shogun/io/streaming/StreamingVwCacheFile.h
@@ -53,7 +53,7 @@ class CStreamingVwCacheFile: public CStreamingFile
 	 * @param rw read/write mode
 	 * @param cache_type type of cache - C_NATIVE or C_PROTOBUF
 	 */
-	CStreamingVwCacheFile(char* fname, char rw='r', EVwCacheType cache_type = C_NATIVE);
+	CStreamingVwCacheFile(const char* fname, char rw='r', EVwCacheType cache_type = C_NATIVE);
 
 	/**
 	 * Destructor