diff -up vim80/src/syntax.c.syncolor vim80/src/syntax.c
--- vim80/src/syntax.c.syncolor	2017-08-15 12:14:21.716020676 +0200
+++ vim80/src/syntax.c	2017-08-15 12:30:31.380158974 +0200
@@ -6972,8 +6972,8 @@ static char *(highlight_init_light[]) =
     CENT("Visual term=reverse",
 	 "Visual term=reverse guibg=LightGrey"),
 #ifdef FEAT_DIFF
-    CENT("DiffAdd term=bold ctermbg=LightBlue",
-	 "DiffAdd term=bold ctermbg=LightBlue guibg=LightBlue"),
+    CENT("DiffAdd term=bold ctermbg=LightRed",
+         "DiffAdd term=bold ctermbg=LightRed guibg=LightBlue"),
     CENT("DiffChange term=bold ctermbg=LightMagenta",
 	 "DiffChange term=bold ctermbg=LightMagenta guibg=LightMagenta"),
     CENT("DiffDelete term=bold ctermfg=Blue ctermbg=LightCyan",
@@ -7066,8 +7066,8 @@ static char *(highlight_init_dark[]) = {
     CENT("Visual term=reverse",
 	 "Visual term=reverse guibg=DarkGrey"),
 #ifdef FEAT_DIFF
-    CENT("DiffAdd term=bold ctermbg=DarkBlue",
-	 "DiffAdd term=bold ctermbg=DarkBlue guibg=DarkBlue"),
+    CENT("DiffAdd term=bold ctermbg=DarkRed",
+	 "DiffAdd term=bold ctermbg=DarkRed guibg=DarkBlue"),
     CENT("DiffChange term=bold ctermbg=DarkMagenta",
 	 "DiffChange term=bold ctermbg=DarkMagenta guibg=DarkMagenta"),
     CENT("DiffDelete term=bold ctermfg=Blue ctermbg=DarkCyan",