diff --git a/games/zdoom/zdoom.SlackBuild b/games/zdoom/zdoom.SlackBuild
index 443ff986ab..3661938901 100644
--- a/games/zdoom/zdoom.SlackBuild
+++ b/games/zdoom/zdoom.SlackBuild
@@ -8,6 +8,7 @@
 # version had no license, modified version released under the WTFPL,
 # see http://www.wtfpl.net/txt/copying/ for details.
 
+# 20220318 bkw: fix 32-bit build (disable asm).
 # 20211012 bkw: BUILD=2
 # - Fix -current build.
 # - New-style icons.
@@ -147,7 +148,10 @@ sed -i '/REGEX *MATCH/s,\[3-9\],[1-9][0-9]*,g' game-music-emu/CMakeLists.txt
 mkdir release
 cd release
 
+# 20220318 bkw: the x86 asm code won't build on 15.0, so it's disabled.
+# The x86_64 build never used it.
 cmake \
+  -DNO_ASM=ON \
   -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
   -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
   -DCMAKE_BUILD_TYPE="Release" \