diff --git a/Dockerfile.system-clang b/Dockerfile.system-clang
index 47191e6..bbb19a7 100644
--- a/Dockerfile.system-clang
+++ b/Dockerfile.system-clang
@@ -22,7 +22,10 @@ WORKDIR /build
 
 ENV TOOLCHAIN_PREFIX=/opt/llvm-mingw
 
-ARG TOOLCHAIN_ARCHS="i686 x86_64 armv7 aarch64"
+# build-compiler-rt.sh assumes that sanitizers can be built for all architectures.
+# Sanitizers can be built for aarch64 since LLVM 14 and for armv7 since LLVM 19.
+# For simplicity, just skip building for armv7 when building an older version.
+ARG TOOLCHAIN_ARCHS="i686 x86_64 aarch64"
 
 ARG DEFAULT_CRT=ucrt