diff --git a/srcpkgs/k3b/patches/fix-gcc6-narrowing.patch b/srcpkgs/k3b/patches/fix-gcc6-narrowing.patch
new file mode 100644
index 0000000000..5a17f4f5e4
--- /dev/null
+++ b/srcpkgs/k3b/patches/fix-gcc6-narrowing.patch
@@ -0,0 +1,76 @@
+Use characters instead of numeric constants to avoid the
+gcc6 narrowing warning.
+
+--- libk3b/tools/k3bwavefilewriter.cpp	2014-11-04 19:37:31.000000000 +0100
++++ libk3b/tools/k3bwavefilewriter.cpp	2016-09-22 18:26:13.443173213 +0200
+@@ -111,17 +111,17 @@
+ {
+     static const char riffHeader[] =
+         {
+-            0x52, 0x49, 0x46, 0x46, // 0  "RIFF"
+-            0x00, 0x00, 0x00, 0x00, // 4  wavSize
+-            0x57, 0x41, 0x56, 0x45, // 8  "WAVE"
+-            0x66, 0x6d, 0x74, 0x20, // 12 "fmt "
+-            0x10, 0x00, 0x00, 0x00, // 16
+-            0x01, 0x00, 0x02, 0x00, // 20
+-            0x44, 0xac, 0x00, 0x00, // 24
+-            0x10, 0xb1, 0x02, 0x00, // 28
+-            0x04, 0x00, 0x10, 0x00, // 32
+-            0x64, 0x61, 0x74, 0x61, // 36 "data"
+-            0x00, 0x00, 0x00, 0x00  // 40 byteCount
++            '\x52', '\x49', '\x46', '\x46', // 0  "RIFF"
++            '\x00', '\x00', '\x00', '\x00', // 4  wavSize
++            '\x57', '\x41', '\x56', '\x45', // 8  "WAVE"
++            '\x66', '\x6d', '\x74', '\x20', // 12 "fmt "
++            '\x10', '\x00', '\x00', '\x00', // 16
++            '\x01', '\x00', '\x02', '\x00', // 20
++            '\x44', '\xac', '\x00', '\x00', // 24
++            '\x10', '\xb1', '\x02', '\x00', // 28
++            '\x04', '\x00', '\x10', '\x00', // 32
++            '\x64', '\x61', '\x74', '\x61', // 36 "data"
++            '\x00', '\x00', '\x00', '\x00'  // 40 byteCount
+         };
+ 
+     m_outputStream.writeRawData( riffHeader, 44 );
+--- libk3b/projects/k3bcdrdaowriter.cpp	2014-11-04 19:37:31.000000000 +0100
++++ libk3b/projects/k3bcdrdaowriter.cpp	2016-09-22 18:30:15.231271203 +0200
+@@ -908,7 +908,7 @@
+ 
+ void K3b::CdrdaoWriter::parseCdrdaoMessage()
+ {
+-    static const char msgSync[] = { 0xff, 0x00, 0xff, 0x00 };
++    static const char msgSync[] = { '\xff', '\x00', '\xff', '\x00' };
+     unsigned int avail = m_comSock->bytesAvailable();
+     unsigned int msgs = avail / ( sizeof(msgSync)+d->progressMsgSize );
+     unsigned int count = 0;
+--- plugins/encoder/external/k3bexternalencoder.cpp	2014-11-04 19:37:31.000000000 +0100
++++ plugins/encoder/external/k3bexternalencoder.cpp	2016-09-22 18:33:15.300347286 +0200
+@@ -39,17 +39,17 @@
+ 
+ static const char s_riffHeader[] =
+ {
+-    0x52, 0x49, 0x46, 0x46, // 0  "RIFF"
+-    0x00, 0x00, 0x00, 0x00, // 4  wavSize
+-    0x57, 0x41, 0x56, 0x45, // 8  "WAVE"
+-    0x66, 0x6d, 0x74, 0x20, // 12 "fmt "
+-    0x10, 0x00, 0x00, 0x00, // 16
+-    0x01, 0x00, 0x02, 0x00, // 20
+-    0x44, 0xac, 0x00, 0x00, // 24
+-    0x10, 0xb1, 0x02, 0x00, // 28
+-    0x04, 0x00, 0x10, 0x00, // 32
+-    0x64, 0x61, 0x74, 0x61, // 36 "data"
+-    0x00, 0x00, 0x00, 0x00  // 40 byteCount
++    '\x52', '\x49', '\x46', '\x46', // 0  "RIFF"
++    '\x00', '\x00', '\x00', '\x00', // 4  wavSize
++    '\x57', '\x41', '\x56', '\x45', // 8  "WAVE"
++    '\x66', '\x6d', '\x74', '\x20', // 12 "fmt "
++    '\x10', '\x00', '\x00', '\x00', // 16
++    '\x01', '\x00', '\x02', '\x00', // 20
++    '\x44', '\xac', '\x00', '\x00', // 24
++    '\x10', '\xb1', '\x02', '\x00', // 28
++    '\x04', '\x00', '\x10', '\x00', // 32
++    '\x64', '\x61', '\x74', '\x61', // 36 "data"
++    '\x00', '\x00', '\x00', '\x00'  // 40 byteCount
+ };
+ 
+