diff --git a/share/completions/wc.fish b/share/completions/wc.fish
index a9c2dcc39..efbccb3d6 100644
--- a/share/completions/wc.fish
+++ b/share/completions/wc.fish
@@ -1,7 +1,20 @@
-complete -c wc -s c -l bytes -d "Print byte counts"
-complete -c wc -s m -l chars -d "Print character counts"
-complete -c wc -s l -l lines -d "Print newline counts"
-complete -c wc -s L -l max-line-length -d "Print length of longest line"
-complete -c wc -s w -l words -d "Print word counts"
-complete -c wc -l help -d "Display help and exit"
-complete -c wc -l version -d "Display version and exit"
+if command -q wc && command wc --version >/dev/null 2>/dev/null
+	complete -c wc -s c -l bytes -d "Print byte count"
+	complete -c wc -s m -l chars -d "Print character count"
+	complete -c wc -s l -l lines -d "Print number of lines"
+	complete -c wc -s L -l max-line-length -d "Print length of longest line"
+	complete -c wc -s w -l words -d "Print number of words"
+	complete -c wc -l help -d "Display help and exit"
+	complete -c wc -l version -d "Display version and exit"
+else
+	complete -c wc -s c -d "Print byte count"
+	complete -c wc -s m -d "Print character count"
+	complete -c wc -s l -d "Print number of lines"
+	complete -c wc -s w -d "Print number of words"
+	switch (uname -s)
+		case FreeBSD NetBSD
+			complete -c wc -s L -d "Print length of longest line"
+		case OpenBSD
+			complete -c wc -s h -d "Use B, KB, MB, GB, TB, PB, EB unit suffixes"
+	end
+end