diff --git a/Marlin/src/HAL/STM32F1/build_flags.py b/Marlin/src/HAL/STM32F1/build_flags.py
index c51fd4fa58..d0848d1c64 100755
--- a/Marlin/src/HAL/STM32F1/build_flags.py
+++ b/Marlin/src/HAL/STM32F1/build_flags.py
@@ -11,6 +11,7 @@ if __name__ == "__main__":
                     "-fsigned-char",
                     "-fno-move-loop-invariants",
                     "-fno-strict-aliasing",
+                    "-fsingle-precision-constant",
 
                     "--specs=nano.specs",
                     "--specs=nosys.specs",