diff --git a/clang/lib/Driver/ToolChains/WebAssembly.cpp b/clang/lib/Driver/ToolChains/WebAssembly.cpp
--- a/clang/lib/Driver/ToolChains/WebAssembly.cpp
+++ b/clang/lib/Driver/ToolChains/WebAssembly.cpp
@@ -106,17 +106,15 @@
 
   getProgramPaths().push_back(getDriver().getInstalledDir());
 
-  if (getTriple().getOS() == llvm::Triple::UnknownOS) {
-    // Theoretically an "unknown" OS should mean no standard libraries, however
-    // it could also mean that a custom set of libraries is in use, so just add
-    // /lib to the search path. Disable multiarch in this case, to discourage
-    // paths containing "unknown" from acquiring meanings.
-    getFilePaths().push_back(getDriver().SysRoot + "/lib");
-  } else {
+  if (getTriple().getOS() != llvm::Triple::UnknownOS) {
+    // Disable multiarch for UnknownOS, to discourage paths containing "unknown"
+    // from acquiring meanings.
     const std::string MultiarchTriple =
         getMultiarchTriple(getDriver(), Triple, getDriver().SysRoot);
     getFilePaths().push_back(getDriver().SysRoot + "/lib/" + MultiarchTriple);
   }
+
+  getFilePaths().push_back(getDriver().SysRoot + "/lib");
 }
 
 bool WebAssembly::IsMathErrnoDefault() const { return false; }
diff --git a/clang/test/Driver/wasm-toolchain.c b/clang/test/Driver/wasm-toolchain.c
--- a/clang/test/Driver/wasm-toolchain.c
+++ b/clang/test/Driver/wasm-toolchain.c
@@ -26,13 +26,13 @@
 
 // RUN: %clang -### -no-canonical-prefixes -target wasm32-wasi --sysroot=/foo %s 2>&1 | FileCheck -check-prefix=LINK_KNOWN %s
 // LINK_KNOWN: clang{{.*}}" "-cc1" {{.*}} "-o" "[[temp:[^"]*]]"
-// LINK_KNOWN: wasm-ld{{.*}}" "-L/foo/lib/wasm32-wasi" "crt1.o" "[[temp]]" "-lc" "{{.*[/\\]}}libclang_rt.builtins-wasm32.a" "-o" "a.out"
+// LINK_KNOWN: wasm-ld{{.*}}" "-L/foo/lib/wasm32-wasi" "-L/foo/lib" "crt1.o" "[[temp]]" "-lc" "{{.*[/\\]}}libclang_rt.builtins-wasm32.a" "-o" "a.out"
 
 // A basic C link command-line with optimization with known OS.
 
 // RUN: %clang -### -O2 -no-canonical-prefixes -target wasm32-wasi --sysroot=/foo %s 2>&1 | FileCheck -check-prefix=LINK_OPT_KNOWN %s
 // LINK_OPT_KNOWN: clang{{.*}}" "-cc1" {{.*}} "-o" "[[temp:[^"]*]]"
-// LINK_OPT_KNOWN: wasm-ld{{.*}}" "-L/foo/lib/wasm32-wasi" "crt1.o" "[[temp]]" "-lc" "{{.*[/\\]}}libclang_rt.builtins-wasm32.a" "-o" "a.out"
+// LINK_OPT_KNOWN: wasm-ld{{.*}}" "-L/foo/lib/wasm32-wasi" "-L/foo/lib" "crt1.o" "[[temp]]" "-lc" "{{.*[/\\]}}libclang_rt.builtins-wasm32.a" "-o" "a.out"
 
 // A basic C compile command-line with known OS.
 
diff --git a/clang/test/Driver/wasm-toolchain.cpp b/clang/test/Driver/wasm-toolchain.cpp
--- a/clang/test/Driver/wasm-toolchain.cpp
+++ b/clang/test/Driver/wasm-toolchain.cpp
@@ -26,13 +26,13 @@
 
 // RUN: %clangxx -### -no-canonical-prefixes -target wasm32-wasi --sysroot=/foo --stdlib=c++ %s 2>&1 | FileCheck -check-prefix=LINK_KNOWN %s
 // LINK_KNOWN: clang{{.*}}" "-cc1" {{.*}} "-o" "[[temp:[^"]*]]"
-// LINK_KNOWN: wasm-ld{{.*}}" "-L/foo/lib/wasm32-wasi" "crt1.o" "[[temp]]" "-lc++" "-lc++abi" "-lc" "{{.*[/\\]}}libclang_rt.builtins-wasm32.a" "-o" "a.out"
+// LINK_KNOWN: wasm-ld{{.*}}" "-L/foo/lib/wasm32-wasi" "-L/foo/lib" "crt1.o" "[[temp]]" "-lc++" "-lc++abi" "-lc" "{{.*[/\\]}}libclang_rt.builtins-wasm32.a" "-o" "a.out"
 
 // A basic C++ link command-line with optimization with known OS.
 
 // RUN: %clangxx -### -O2 -no-canonical-prefixes -target wasm32-wasi --sysroot=/foo %s --stdlib=c++ 2>&1 | FileCheck -check-prefix=LINK_OPT_KNOWN %s
 // LINK_OPT_KNOWN: clang{{.*}}" "-cc1" {{.*}} "-o" "[[temp:[^"]*]]"
-// LINK_OPT_KNOWN: wasm-ld{{.*}}" "-L/foo/lib/wasm32-wasi" "crt1.o" "[[temp]]" "-lc++" "-lc++abi" "-lc" "{{.*[/\\]}}libclang_rt.builtins-wasm32.a" "-o" "a.out"
+// LINK_OPT_KNOWN: wasm-ld{{.*}}" "-L/foo/lib/wasm32-wasi" "-L/foo/lib" "crt1.o" "[[temp]]" "-lc++" "-lc++abi" "-lc" "{{.*[/\\]}}libclang_rt.builtins-wasm32.a" "-o" "a.out"
 
 // A basic C++ compile command-line with known OS.