diff --git a/src/gen-lock-obj.sh b/src/gen-lock-obj.sh
index a710f0c..258eec6 100755
--- a/src/gen-lock-obj.sh
+++ b/src/gen-lock-obj.sh
@@ -1,136 +1,136 @@
 #! /bin/sh
 #
 # gen-lock-obj.sh - Build tool to construct the lock object.
 #
 # Copyright (C) 2020, 2021  g10 Code GmbH
 #
 # This file is part of libgpg-error.
 #
 # libgpg-error is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public License
 # as published by the Free Software Foundation; either version 2.1 of
 # the License, or (at your option) any later version.
 #
 # libgpg-error is distributed in the hope that it will be useful, but
 # WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 # Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public
 # License along with this program; if not, see <https://www.gnu.org/licenses/>.
 #
 
 #
 # Following variables should be defined to invoke this script
 #
 #   CC
 #   OBJDUMP
 #   AWK
 #   ac_ext
 #   ac_object
 #   host
 #   LOCK_ABI_VERSION
 #
 # An example:
 #
 # LOCK_ABI_VERSION=1 host=x86_64-pc-linux-gnu host_alias=x86_64-linux-gnu \
 #     CC=$host_alias-gcc OBJDUMP=$host_alias-objdump ac_ext=c ac_objext=o \
 #     AWK=gawk ./gen-lock-obj.sh
 #
 
-if test -n `echo -n`; then
+if test -n "`echo -n`"; then
     ECHO_C='\c'
     ECHO_N=''
 else
     ECHO_C=''
     ECHO_N='-n'
 fi
 
 if test "$1" = --disable-threads; then
     cat <<EOF
 ## lock-obj-pub.$host.h - NO LOCK SUPPORT
 ## File created by gen-lock-obj.sh - DO NOT EDIT
 ## To be included by mkheader into gpg-error.h
 
 /* Dummy object - no locking available.  */
 typedef struct
 {
   long _vers;
 } gpgrt_lock_t;
 
 #define GPGRT_LOCK_INITIALIZER {-1}
 EOF
 else
 AWK_VERSION_OUTPUT=$($AWK 'BEGIN { print PROCINFO["version"] }')
 if test -n "$AWK_VERSION_OUTPUT"; then
     # It's GNU awk, which supports PROCINFO.
     AWK_OPTION=--non-decimal-data
 fi
 
 cat <<'EOF' >conftest.$ac_ext
 #include <pthread.h>
 pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
 EOF
 
 if $CC -c conftest.$ac_ext; then :
   ac_mtx_size=$($OBJDUMP -j .bss -t conftest.$ac_objext \
          | $AWK $AWK_OPTION '
 /mtx$/ { mtx_size = int("0x" $5) }
 END { print mtx_size }')
 else
     echo "Can't determine mutex size"
     exit 1
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 cat <<EOF
 ## lock-obj-pub.$host.h
 ## File created by gen-lock-obj.sh - DO NOT EDIT
 ## To be included by mkheader into gpg-error.h
 
 typedef struct
 {
   long _vers;
   union {
     volatile char _priv[$ac_mtx_size];
     long _x_align;
     long *_xp_align;
   } u;
 } gpgrt_lock_t;
 
 EOF
 
 # FIXME: Support different alignment conditions of:
 #
 #     USE_16BYTE_ALIGNMENT
 #     USE_DOUBLE_FOR_ALIGNMENT
 #     USE_LONG_DOUBLE_FOR_ALIGNMENT
 #
 
 echo ${ECHO_N} "#define GPGRT_LOCK_INITIALIZER {$LOCK_ABI_VERSION,{{${ECHO_C}"
 
 i=0
 while test "$i" -lt $ac_mtx_size; do
     if test "$i" -ne 0 -a "$(( $i % 8 ))" -eq 0; then
         echo ' \'
         echo ${ECHO_N} "                                    ${ECHO_C}"
     fi
     echo ${ECHO_N} "0${ECHO_C}"
     if test "$i" -lt $(($ac_mtx_size - 1)); then
         echo ${ECHO_N} ",${ECHO_C}"
     fi
     i=$(( i + 1 ))
 done
 fi
 
 cat <<'EOF'
 }}}
 ##
 ## Local Variables:
 ## mode: c
 ## buffer-read-only: t
 ## End:
 ##
 EOF
 
 exit 0