1 files changed, 2 insertions, 2 deletions

diff --git a/src/man/preproc.awk b/src/man/preproc.awk
index 20081b551..1471be3ec 100755
--- a/src/man/preproc.awk
+++ b/src/man/preproc.awk
@@ -23,7 +23,7 @@
 BEGIN {
         macros[0] = 0
         for (arg in ARGV) {
-                if (ARGV[arg] ~ /^-D[A-Z_]+$/) {
+                if (ARGV[arg] ~ /^-D[A-Z0-9_]+$/) {
                         macros[length(macros) + 1] = substr(ARGV[arg], 3)
                 }
                 ARGV[arg] = ""
@@ -31,7 +31,7 @@ BEGIN {
 
         include = 1
 }
-/^#ifdef [A-Z_]+$/ {
+/^#ifdef [A-Z0-9_]+$/ {
         macro = substr($0, 8)
         for (i in macros) {
                 if (macros[i] == macro) {