diff --git a/configure.in b/configure.in
index 19500837e..03350a4ea 100644
--- a/configure.in
+++ b/configure.in
@@ -2291,7 +2291,7 @@ case "$target" in
             ac_default_prefix=/usr/local/cross-tools/i386-mingw32msvc
         else
             # Look for the location of the tools and install there
-            if [ "$BUILD_PREFIX" != "" ]; then
+            if test "$BUILD_PREFIX" != ""; then
                 ac_default_prefix=$BUILD_PREFIX
             fi
         fi