diff --git a/postgresql-libpq-configure/configure b/postgresql-libpq-configure/configure
index 2ca3096..8543ddb 100755
--- a/postgresql-libpq-configure/configure
+++ b/postgresql-libpq-configure/configure
@@ -3851,7 +3851,7 @@ do
       ac_path_PG_CONFIG="$as_dir$ac_prog$ac_exec_ext"
       as_fn_executable_p "$ac_path_PG_CONFIG" || continue
 ac_cv_path_PG_CONFIG="";$ac_path_PG_CONFIG --includedir > /dev/null \
-		&& ac_cv_path_PG_CONFIG=$ac_path_PG_CONFIG ac_path_PG_CONFIG_found=:
+		&& ac_cv_path_PG_CONFIG="$ac_path_PG_CONFIG" ac_path_PG_CONFIG_found=:
       $ac_path_PG_CONFIG_found && break 3
     done
   done
@@ -3867,7 +3867,7 @@ fi
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_PG_CONFIG" >&5
 printf "%s\n" "$ac_cv_path_PG_CONFIG" >&6; }
-	  PG_CONFIG=$ac_cv_path_PG_CONFIG
+	  PG_CONFIG="$ac_cv_path_PG_CONFIG"
 	  if test "X$PG_CONFIG" = "X"
 then :
   break
diff --git a/postgresql-libpq-configure/m4/ax_lib_postgresql.m4 b/postgresql-libpq-configure/m4/ax_lib_postgresql.m4
index ec267f0..4ba63fb 100644
--- a/postgresql-libpq-configure/m4/ax_lib_postgresql.m4
+++ b/postgresql-libpq-configure/m4/ax_lib_postgresql.m4
@@ -59,9 +59,9 @@ AC_DEFUN([_AX_LIB_POSTGRESQL_OLD],[
 	  AC_CACHE_CHECK([for the pg_config program], [ac_cv_path_PG_CONFIG],
 	    [AC_PATH_PROGS_FEATURE_CHECK([PG_CONFIG], [pg_config],
 	      [[ac_cv_path_PG_CONFIG="";$ac_path_PG_CONFIG --includedir > /dev/null \
-		&& ac_cv_path_PG_CONFIG=$ac_path_PG_CONFIG ac_path_PG_CONFIG_found=:]],
+		&& ac_cv_path_PG_CONFIG="$ac_path_PG_CONFIG" ac_path_PG_CONFIG_found=:]],
 	      [ac_cv_path_PG_CONFIG=""])])
-	  PG_CONFIG=$ac_cv_path_PG_CONFIG
+	  PG_CONFIG="$ac_cv_path_PG_CONFIG"
 	  AS_IF([test "X$PG_CONFIG" = "X"],[break])
 
 	  AC_CACHE_CHECK([for the PostgreSQL libraries CPPFLAGS],[ac_cv_POSTGRESQL_CPPFLAGS],