diff --git a/include/JSystem/JGeometry.h b/include/JSystem/JGeometry.h
index 773195392e..82801b5603 100644
--- a/include/JSystem/JGeometry.h
+++ b/include/JSystem/JGeometry.h
@@ -7,8 +7,10 @@
 
 #ifndef __MWERKS__
 #include <limits>
+#if !defined(FLT_EPSILON)
 #define FLT_EPSILON std::numeric_limits<float>::epsilon()
 #endif
+#endif
 
 namespace JGeometry {