diff --git a/libraries/libmp4v2/libmp4v2-2.0.0-unsigned-int-cast.patch b/libraries/libmp4v2/libmp4v2-2.0.0-unsigned-int-cast.patch
new file mode 100644
index 0000000000..25830bc596
--- /dev/null
+++ b/libraries/libmp4v2/libmp4v2-2.0.0-unsigned-int-cast.patch
@@ -0,0 +1,96 @@
+From a5ca35b044bbf13c0b16f0066bf24646604bb218 Mon Sep 17 00:00:00 2001
+From: "Jason A. Donenfeld" <Jason@zx2c4.com>
+Date: Thu, 6 Aug 2020 15:22:04 +0200
+Subject: [PATCH] Static cast to unsigned int for cases
+
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+---
+ libutil/Utility.cpp  | 2 +-
+ util/mp4art.cpp      | 2 +-
+ util/mp4chaps.cpp    | 2 +-
+ util/mp4file.cpp     | 2 +-
+ util/mp4subtitle.cpp | 2 +-
+ util/mp4track.cpp    | 2 +-
+ 6 files changed, 6 insertions(+), 6 deletions(-)
+
+diff --git a/libutil/Utility.cpp b/libutil/Utility.cpp
+index 76cdd12..d6739d4 100644
+--- a/libutil/Utility.cpp
++++ b/libutil/Utility.cpp
+@@ -493,7 +493,7 @@ Utility::process_impl()
+         if( codes.find( code ) == codes.end() )
+             continue;
+ 
+-        switch( code ) {
++        switch( static_cast<unsigned int>( code ) ) {
+             case 'z':
+                 _optimize = true;
+                 break;
+diff --git a/util/mp4art.cpp b/util/mp4art.cpp
+index add935e..6e7f531 100644
+--- a/util/mp4art.cpp
++++ b/util/mp4art.cpp
+@@ -376,7 +376,7 @@ ArtUtility::utility_option( int code, bool& handled )
+ {
+     handled = true;
+ 
+-    switch( code ) {
++    switch( static_cast<unsigned int> ( code ) ) {
+         case LC_ART_ANY:
+             _artFilter = numeric_limits<uint32_t>::max();
+             break;
+diff --git a/util/mp4chaps.cpp b/util/mp4chaps.cpp
+index 98400f8..ccc8b70 100644
+--- a/util/mp4chaps.cpp
++++ b/util/mp4chaps.cpp
+@@ -632,7 +632,7 @@ ChapterUtility::utility_option( int code, bool& handled )
+ {
+     handled = true;
+ 
+-    switch( code ) {
++    switch( static_cast<unsigned int> ( code ) ) {
+         case 'A':
+         case LC_CHPT_ANY:
+             _ChapterType = MP4ChapterTypeAny;
+diff --git a/util/mp4file.cpp b/util/mp4file.cpp
+index c27844b..b127cd1 100644
+--- a/util/mp4file.cpp
++++ b/util/mp4file.cpp
+@@ -189,7 +189,7 @@ FileUtility::utility_option( int code, bool& handled )
+ {
+     handled = true;
+ 
+-    switch( code ) {
++    switch( static_cast<unsigned int>( code ) ) {
+         case LC_LIST:
+             _action = &FileUtility::actionList;
+             break;
+diff --git a/util/mp4subtitle.cpp b/util/mp4subtitle.cpp
+index 7462153..19d977d 100644
+--- a/util/mp4subtitle.cpp
++++ b/util/mp4subtitle.cpp
+@@ -164,7 +164,7 @@ SubtitleUtility::utility_option( int code, bool& handled )
+ {
+     handled = true;
+ 
+-    switch( code ) {
++    switch( static_cast<unsigned int>( code ) ) {
+         case LC_LIST:
+             _action = &SubtitleUtility::actionList;
+             break;
+diff --git a/util/mp4track.cpp b/util/mp4track.cpp
+index d550506..cd63d7e 100644
+--- a/util/mp4track.cpp
++++ b/util/mp4track.cpp
+@@ -788,7 +788,7 @@ TrackUtility::utility_option( int code, bool& handled )
+ {
+     handled = true;
+ 
+-    switch( code ) {
++    switch( static_cast<unsigned int>( code ) ) {
+         case LC_TRACK_WILDCARD:
+             _trackMode = TM_WILDCARD;
+             break;
+-- 
+2.28.0
+
diff --git a/libraries/libmp4v2/libmp4v2.SlackBuild b/libraries/libmp4v2/libmp4v2.SlackBuild
index a7e1eb8c40..28d9fe3a22 100644
--- a/libraries/libmp4v2/libmp4v2.SlackBuild
+++ b/libraries/libmp4v2/libmp4v2.SlackBuild
@@ -81,6 +81,9 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
+# thanks to Gentoo!
+patch -p1 < $CWD/libmp4v2-2.0.0-unsigned-int-cast.patch
+
 autoreconf -vif
 
 CFLAGS="$SLKCFLAGS" \