diff --git a/src/core/include/mp-units/core.h b/src/core/include/mp-units/core.h
index 02be2641..09ba3ac3 100644
--- a/src/core/include/mp-units/core.h
+++ b/src/core/include/mp-units/core.h
@@ -25,9 +25,12 @@
 // IWYU pragma: begin_exports
 #include <mp-units/compat_macros.h>
 #include <mp-units/concepts.h>
-#include <mp-units/format.h>
 #include <mp-units/framework.h>
+
+#if MP_UNITS_HOSTED
+#include <mp-units/format.h>
 #include <mp-units/math.h>
 #include <mp-units/ostream.h>
 #include <mp-units/random.h>
+#endif
 // IWYU pragma: end_exports