diff --git a/Marlin/src/gcode/calibrate/G34_M422.cpp b/Marlin/src/gcode/calibrate/G34_M422.cpp
index 8b94dd5392..7a27a61b9d 100644
--- a/Marlin/src/gcode/calibrate/G34_M422.cpp
+++ b/Marlin/src/gcode/calibrate/G34_M422.cpp
@@ -115,8 +115,8 @@ void GcodeSuite::G34() {
       }
 
       const float z_auto_align_accuracy = parser.floatval('T', Z_STEPPER_ALIGN_ACC);
-      if (!WITHIN(z_auto_align_accuracy, 0.01f, 1.0f)) {
-        SERIAL_ECHOLNPGM(GCODE_ERR_MSG("(T)arget accuracy out of bounds (0.01-1.0)."));
+      if (!WITHIN(z_auto_align_accuracy, 0.001f, 1.0f)) {
+        SERIAL_ECHOLNPGM(GCODE_ERR_MSG("(T)arget accuracy out of bounds (0.001-1.0)."));
         break;
       }
 
diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index fdc78aa3e4..327d55760a 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -3617,6 +3617,7 @@ static_assert(_PLUS_TEST(3), "DEFAULT_MAX_ACCELERATION values must be positive."
       #error "Z_STEPPER_ALIGN_STEPPER_XY requires 3 or 4 Z steppers."
     #endif
   #endif
+  static_assert(WITHIN(Z_STEPPER_ALIGN_ACC, 0.001, 1.0), "Z_STEPPER_ALIGN_ACC needs to be between 0.001 and 1.0");
 #endif
 
 #if ENABLED(MECHANICAL_GANTRY_CALIBRATION)