diff --git a/tools/array_ops.h b/tools/array_ops.h
index 48801ff..661bd2f 100644
--- a/tools/array_ops.h
+++ b/tools/array_ops.h
@@ -18,9 +18,11 @@
 #ifndef ARRAY_OPS_H
 #define ARRAY_OPS_H
 
+#ifdef __SIZEOF_FLOAT__
 #if __SIZEOF_FLOAT__ != 4
 	#error wrong size of float
 #endif
+#endif
 
 typedef float v4sf __attribute__ ((vector_size (16))); // vector of four single floats