diff --git a/doc/build.py b/doc/build.py
index 078f2238..0c856b20 100755
--- a/doc/build.py
+++ b/doc/build.py
@@ -94,7 +94,7 @@ def build_docs(version='dev', **kwargs):
                           "FMT_BEGIN_NAMESPACE=namespace fmt {{" \
                           "FMT_END_NAMESPACE=}}" \
                           "FMT_STRING_ALIAS=1" \
-                          "FMT_ENABLE_IF_T(B)=int"
+                          "FMT_ENABLE_IF_T(B)="
       EXCLUDE_SYMBOLS   = fmt::internal::* StringValue write_str
     '''.format(include_dir, doxyxml_dir).encode('UTF-8'))
   if p.returncode != 0: