diff --git a/devel/ccsd_gpu/gpu_dgemm.c b/devel/ccsd_gpu/gpu_dgemm.c
index d824da3..70d5601 100644
--- a/devel/ccsd_gpu/gpu_dgemm.c
+++ b/devel/ccsd_gpu/gpu_dgemm.c
@@ -5,6 +5,7 @@
 #include <cublas_v2.h>
 #include <cuda_runtime.h>
 #include <assert.h>
+#include "gpu.h"
 
 #define BLOCK_SIZE 16