diff --git a/stim/math/vec3.h b/stim/math/vec3.h
index 41c2f07..8674a3a 100644
--- a/stim/math/vec3.h
+++ b/stim/math/vec3.h
@@ -5,6 +5,10 @@
 #include <stim/cuda/cudatools/callable.h>
 #include <cmath>
 
+#ifndef __CUDACC__
+#include <sstream>
+#endif
+
 
 namespace stim{
 
@@ -243,9 +247,9 @@ public:
 			return false;	
 	}
 
-//#ifndef __CUDA_ARCH__
+#ifndef __CUDACC__
 	/// Outputs the vector as a string
-CUDA_UNCALLABLE	std::string str() const{
+std::string str() const{
 		std::stringstream ss;
 
 		const size_t N = 3;
@@ -261,7 +265,7 @@ CUDA_UNCALLABLE	std::string str() const{
 
 		return ss.str();
 	}
-//#endif
+#endif
 
 	size_t size(){ return 3; }
 
--
libgit2 0.21.4