diff --git a/configure.in b/configure.in
index b210db113e24..c031d653ee71 100644
--- a/configure.in
+++ b/configure.in
@@ -2882,7 +2882,11 @@ AC_SUBST(VISIBILITY_FLAGS)
 
 MOZ_GCC_PR49911
 MOZ_GCC_PR39608
-MOZ_LLVM_PR8927
+if test "$OS_TARGET" != WINNT; then
+    # Only run this test with clang on non-Windows platforms, because clang
+    # cannot do enough code gen for now to make this test work correctly.
+    MOZ_LLVM_PR8927
+fi
 
 dnl Check for __force_align_arg_pointer__ for SSE2 on gcc
 dnl ========================================================
diff --git a/js/src/configure.in b/js/src/configure.in
index 9f41fa9de187..d29998fde5a0 100644
--- a/js/src/configure.in
+++ b/js/src/configure.in
@@ -2457,7 +2457,11 @@ AC_SUBST(VISIBILITY_FLAGS)
 
 MOZ_GCC_PR49911
 MOZ_GCC_PR39608
-MOZ_LLVM_PR8927
+if test "$OS_TARGET" != WINNT; then
+    # Only run this test with clang on non-Windows platforms, because clang
+    # cannot do enough code gen for now to make this test work correctly.
+    MOZ_LLVM_PR8927
+fi
 
 dnl Checks for header files.
 dnl ========================================================