diff --git a/openair1/PHY/TOOLS/tools_defs.h b/openair1/PHY/TOOLS/tools_defs.h
index 279cfd0e51..772dd54e8b 100644
--- a/openair1/PHY/TOOLS/tools_defs.h
+++ b/openair1/PHY/TOOLS/tools_defs.h
@@ -90,7 +90,7 @@ extern "C" {
     int dim2;
     int dim3;
     int dim4;
-    uint8_t data[];
+    uint8_t data[] __attribute__((aligned(32)));
   } fourDimArray_t;
 
   static inline fourDimArray_t *allocateFourDimArray(int elmtSz, int dim1, int dim2, int dim3, int dim4)