diff --git a/configure b/configure
index def8aaae5b..5f830dbd84 100755
--- a/configure
+++ b/configure
@@ -14619,7 +14619,7 @@ if test "$wxUSE_THREADS" = "yes"; then
 EOF
 
 
-    if test "$wxUSE_DARWIN" = "0"; then
+    if test "x$wxUSE_DARWIN" != "x1"; then
     CFLAGS="${CFLAGS} -D_REENTRANT"
     CXXFLAGS="${CXXFLAGS} -D_REENTRANT"
   fi
diff --git a/configure.in b/configure.in
index 609aa631c7..652c5c96aa 100644
--- a/configure.in
+++ b/configure.in
@@ -3061,7 +3061,7 @@ if test "$wxUSE_THREADS" = "yes"; then
   AC_DEFINE(wxUSE_THREADS)
 
   dnl must define _REENTRANT for multithreaded code except for Darwin/Mac OS X
-  if test "$wxUSE_DARWIN" = "0"; then
+  if test "x$wxUSE_DARWIN" != "x1"; then
     CFLAGS="${CFLAGS} -D_REENTRANT"
     CXXFLAGS="${CXXFLAGS} -D_REENTRANT"
   fi