diff --git a/debian/Makefile b/debian/Makefile
index cca0d3d..5215ab2 100644
--- a/debian/Makefile
+++ b/debian/Makefile
@@ -50,6 +50,7 @@
 MODULE_VERSION_xslt=		$(BASE_VERSION)
 MODULE_RELEASE_xslt=		1
 
+MODULE_PATCHES_njs=		extra-patch-njs-gcc-o3
 MODULE_SOURCES_njs=		njs-$(MODULE_VERSION_njs).tar.gz
 
 MODULE_CONFARGS_geoip=		--with-http_geoip_module=dynamic \
diff --git a/debian/extra/extra-patch-njs-gcc-o3 b/debian/extra/extra-patch-njs-gcc-o3
new file mode 100644
index 0000000..6fd69f2
--- /dev/null
+++ b/debian/extra/extra-patch-njs-gcc-o3
@@ -0,0 +1,30 @@
+
+# HG changeset patch
+# User Dmitry Volyntsev <xeioex@nginx.com>
+# Date 1511366157 -10800
+# Node ID 22cc52416e84135c52b5d8ab209c2d3121b3a318
+# Parent  5eb2620a9becc18b385b920a93c3f5d0233291b7
+Fixed building by GCC with -O3.
+
+diff -r 5eb2620a9bec -r 22cc52416e84 njs/njs_fs.c
+--- a/njs-0.1.15/njs/njs_fs.c	Mon Nov 20 20:08:56 2017 +0300
++++ b/njs-0.1.15/njs/njs_fs.c	Wed Nov 22 18:55:57 2017 +0300
+@@ -566,6 +566,8 @@
+     }
+ 
+     mode = NULL;
++    /* GCC complains about uninitialized flag.length. */
++    flag.length = 0;
+     flag.start = NULL;
+     encoding.length = 0;
+     encoding.start = NULL;
+@@ -753,6 +755,8 @@
+     }
+ 
+     mode = NULL;
++    /* GCC complains about uninitialized flag.length. */
++    flag.length = 0;
+     flag.start = NULL;
+     encoding.length = 0;
+     encoding.start = NULL;
+