diff --git a/doc/build.py b/doc/build.py
index c5dafc7e..06537404 100755
--- a/doc/build.py
+++ b/doc/build.py
@@ -58,7 +58,6 @@ def build_docs(version='dev', **kwargs):
       MACRO_EXPANSION   = YES
       PREDEFINED        = _WIN32=1 \
                           __linux__=1 \
-                          FMT_ENABLE_IF(...)=int = 0 \
                           FMT_USE_VARIADIC_TEMPLATES=1 \
                           FMT_USE_RVALUE_REFERENCES=1 \
                           FMT_USE_USER_DEFINED_LITERALS=1 \