diff --git a/audio/rumor/gcc7.diff b/audio/rumor/gcc7.diff
new file mode 100644
index 0000000000..a8c54f20c0
--- /dev/null
+++ b/audio/rumor/gcc7.diff
@@ -0,0 +1,12 @@
+diff -Naur rumor-1.0.5.orig/src/notator.cc rumor-1.0.5.new/src/notator.cc
+--- rumor-1.0.5.orig/src/notator.cc	2010-11-15 18:40:22.000000000 +0100
++++ rumor-1.0.5.new/src/notator.cc	2017-05-31 15:51:42.014855383 +0200
+@@ -334,7 +334,7 @@
+       }
+     } else {
+       OctaveTic=(RefPitch_wt>AbsPitch_wt?',':'\'');
+-      NumTics=(abs(RefPitch_wt-AbsPitch_wt)+3)/7;
++      NumTics=(RefPitch_wt-AbsPitch_wt+3)/7;
+       RefPitch_wt=AbsPitch_wt;
+     }
+     for (int i=0; i<NumTics; i++){
diff --git a/audio/rumor/rumor.SlackBuild b/audio/rumor/rumor.SlackBuild
index daeebef2b9..d3ee309487 100644
--- a/audio/rumor/rumor.SlackBuild
+++ b/audio/rumor/rumor.SlackBuild
@@ -49,6 +49,9 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \;
 
+# Thanks to archlinux
+patch -p1 < $CWD/gcc7.diff
+
 ./autogen.sh
 
 CFLAGS="$SLKCFLAGS" \