diff --git a/configure.in b/configure.in
index f743de68646..56ce13cf68d 100644
--- a/configure.in
+++ b/configure.in
@@ -7478,7 +7478,7 @@ else
       dnl Look for a broken crtdll.obj
       WIN32_CRTDLL_FULLPATH=`lib -list $WIN32_CRT_LIBS | grep crtdll\\.obj`
       lib -OUT:crtdll.obj $WIN32_CRT_LIBS -EXTRACT:$WIN32_CRTDLL_FULLPATH
-      if grep -q '__imp__?free' crtdll.obj; then
+      if grep -q '__imp__\{0,1\}free' crtdll.obj; then
         MOZ_MEMORY_LDFLAGS='-MANIFEST:NO -LIBPATH:$(DIST)/lib -NODEFAULTLIB:msvcrt -NODEFAULTLIB:msvcrtd -NODEFAULTLIB:msvcprt -NODEFAULTLIB:msvcprtd -DEFAULTLIB:mozcrt'
       else
         MOZ_MEMORY_LDFLAGS='$(DIST)/../memory/jemalloc/jemalloc.lib'