diff --git a/tests/json_fmt.cpp b/tests/json_fmt.cpp
index bf3ccb0..1a2ded0 100644
--- a/tests/json_fmt.cpp
+++ b/tests/json_fmt.cpp
@@ -158,9 +158,11 @@ int main() {
   if (main_readme2() != EXIT_SUCCESS) {
     return EXIT_FAILURE;
   }
+#ifndef __FAST_MATH__
   if (main_readme3() != EXIT_SUCCESS) {
     return EXIT_FAILURE;
   }
+#endif
 
   return EXIT_SUCCESS;
 }
\ No newline at end of file