diff --git a/crates/specialized/rtx-cfd/src/kernels/cuda/reduction.cu b/crates/specialized/rtx-cfd/src/kernels/cuda/reduction.cu
index a3c20cf..fbd151a 100644
--- a/crates/specialized/rtx-cfd/src/kernels/cuda/reduction.cu
+++ b/crates/specialized/rtx-cfd/src/kernels/cuda/reduction.cu
@@ -1,3 +1,6 @@
+#ifndef FLT_MAX
+#define FLT_MAX 3.402823466e+38f
+#endif
 /**
  * CUDA kernels for reduction operations
  *
@@ -10,7 +13,6 @@
  */
 
 // (no host headers: NVRTC compiles these as device code with the built-ins only)
-#include <float.h>
 
 // Warp size constant
 #define WARP_SIZE 32