diff --git a/uf b/uf
index bde9ba1..28c7aba 100755
--- a/uf
+++ b/uf
@@ -66,11 +66,11 @@ while [ $# -ne 0 -a "$(expr "$1" : '\(.\).*')" = "-" ]; do
 done
 
 if [ -n "$REVERT" ]; then
-	awk -v WIDTH=80 '
-	/^>/ { print }
+	gawk -b -O -v WIDTH=80 '
+	/^>/ 
 	/^[^>]/ { for (i=1;i<=length();i+=WIDTH) { print substr($0,i,WIDTH); } }' "$@"
 else
-	awk 'BEGIN { ORS="" }
+	gawk -b -O 'BEGIN { ORS="" }
 	/^>/    { if (NR!=1) print "\n"; print $0 "\n" }
 	/^[^>]/ { print gensub(/[[:space:]]/,"","g") }
 	END { print "\n" }' "$@"
diff --git a/uf-bare b/uf-bare
index 0d5a12b..2816c1b 100755
--- a/uf-bare
+++ b/uf-bare
@@ -48,5 +48,5 @@ while [ $# -ne 0 -a "$(expr "$1" : '\(.\).*')" = "-" ]; do
 	shift
 done
 
-awk 'NR%2==0'
+awk -b -O 'NR%2==0'
 
diff --git a/uf-hdrs b/uf-hdrs
index 5cfb219..c251df0 100755
--- a/uf-hdrs
+++ b/uf-hdrs
@@ -48,5 +48,5 @@ while [ $# -ne 0 -a "$(expr "$1" : '\(.\).*')" = "-" ]; do
 	shift
 done
 
-awk 'NR%2==1'
+awk -b -O 'NR%2==1'
 
diff --git a/uf-map b/uf-map
index 05975db..f25d17a 100755
--- a/uf-map
+++ b/uf-map
@@ -64,5 +64,5 @@ shift
 
 # AWK it
 
-awk "NR%2==1 { print }; NR%2==0 { print | \"$OPERATION\" }"
+awk -b -O "NR%2==1 { print }; NR%2==0 { print | \"$OPERATION\" }"
 
diff --git a/uf-valid b/uf-valid
index 4d3d0bc..cf20c2e 100755
--- a/uf-valid
+++ b/uf-valid
@@ -157,26 +157,26 @@ done
 
 # Do the work
 
-awk -v P="$(basename "$0")" -v WRONG="[^$ALLOW]" -v H=$VAL_HEADERS -v Q=$QUIET -v K=$KEEP_ERRORS -v S=$STOP_ON_ERR -v IGNORECASE=$IGNORE_CASE '
-	{ 	ERR = 0
-		if ( H && $0 !~ /^>[[:alpha:]]+\|\w+(\|\w+)*(\s+.*)?$/ ) {
-			print P ": invalid header at line " NR ": " $0 > "/dev/stderr"
-			ERR = 1
-		}
-		HDR = $0
-		getline SEQ
-		#POS = SEQ ~ WRONG
-		POS = match (SEQ, WRONG)
-		if ( POS ) {
-			print P ": invalid character in sequence at line " NR ", pos " POS ": " substr(SEQ,POS,1) > "/dev/stderr"
-			ERR = 1
-		}
-		if ( (!ERR || K) && !Q ) {
-			print HDR
-			print SEQ
-		}
-		if ( ERR && S ) {
-			exit 1
-		}
-	}' "$@"
+awk -b -O -v P="$(basename "$0")" -v WRONG="[^$ALLOW]" -v H=$VAL_HEADERS -v Q=$QUIET -v K=$KEEP_ERRORS -v S=$STOP_ON_ERR -v IGNORECASE=$IGNORE_CASE '{
+	ERR = 0
+	if ( H && $0 !~ /^>[[:alpha:]]+\|\w+(\|\w+)*(\s+.*)?$/ ) {
+		print P ": invalid header at line " NR ": " $0 > "/dev/stderr"
+		ERR = 1
+	}
+	HDR = $0
+	getline SEQ
+	#POS = SEQ ~ WRONG
+	POS = match (SEQ, WRONG)
+	if ( POS ) {
+		print P ": invalid character in sequence at line " NR ", pos " POS ": " substr(SEQ,POS,1) > "/dev/stderr"
+		ERR = 1
+	}
+	if ( (!ERR || K) && !Q ) {
+		print HDR
+		print SEQ
+	}
+	if ( ERR && S ) {
+		exit 1
+	}
+}' "$@"