diff --git a/libvips/foreign/pdfload.c b/libvips/foreign/pdfload.c
index 78edc9b6..9172dda4 100644
--- a/libvips/foreign/pdfload.c
+++ b/libvips/foreign/pdfload.c
@@ -406,11 +406,11 @@ vips_foreign_load_pdf_file_header( VipsForeignLoad *load )
 	 */
 	path = vips_realpath( file->filename );
 	if( !(file->uri = g_filename_to_uri( path, NULL, &error )) ) { 
-		free( path );
+		g_free( path );
 		vips_g_error( &error );
 		return( -1 ); 
 	}
-	free( path );
+	g_free( path );
 
 	if( !(pdf->doc = poppler_document_new_from_file( 
 		file->uri, NULL, &error )) ) { 
diff --git a/libvips/iofuncs/util.c b/libvips/iofuncs/util.c
index da1d021e..bffc0aa8 100644
--- a/libvips/iofuncs/util.c
+++ b/libvips/iofuncs/util.c
@@ -1750,7 +1750,7 @@ vips_realpath( const char *path )
 		char *cwd;
 
 		cwd = g_get_current_dir();
-		real = g_build_filename( cwd, path );
+		real = g_build_filename( cwd, path, NULL );
 		g_free( cwd );
 	}
 	else