diff --git a/acinclude.m4 b/acinclude.m4
index 0f77f7d51e..455269592a 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -396,7 +396,7 @@ size_t iconv();
     )
 
     iconv_const=
-    if test "x$wx_cv_func_iconv_const" != "xyes"; then
+    if test "x$wx_cv_func_iconv_const" = "xyes"; then
         iconv_const="const"
     fi
 
diff --git a/aclocal.m4 b/aclocal.m4
index 95e83ca11f..5897275add 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -408,7 +408,7 @@ size_t iconv();
     )
 
     iconv_const=
-    if test "x$wx_cv_func_iconv_const" != "xyes"; then
+    if test "x$wx_cv_func_iconv_const" = "xyes"; then
         iconv_const="const"
     fi
 
diff --git a/configure b/configure
index 875ebebf09..ff903f0f18 100755
--- a/configure
+++ b/configure
@@ -15237,7 +15237,7 @@ fi
 echo "$ac_t""$wx_cv_func_iconv_const" 1>&6
 
     iconv_const=
-    if test "x$wx_cv_func_iconv_const" != "xyes"; then
+    if test "x$wx_cv_func_iconv_const" = "xyes"; then
         iconv_const="const"
     fi