diff --git a/onetensor/y_tensor_h.h b/onetensor/y_tensor_h.h
index 8780d20..6e70e0b 100644
--- a/onetensor/y_tensor_h.h
+++ b/onetensor/y_tensor_h.h
@@ -147,6 +147,7 @@ long diff_timespec_nanoseconds(struct timespec time_stop, struct timespec time_s
 
 
 
+#ifndef IMPLEMENTATION_TOOLS
 #define IMPLEMENTATION_TOOLS()\
 \
 GEN_TO_STR_N(TYPE_CHAR,2,"%c")\
@@ -266,7 +267,7 @@ long diff_timespec_nanoseconds(struct timespec time_stop, struct timespec time_s
 }\
 \
 
-
+#endif /* IMPLEMENTATION_TOOLS */
 
 #ifndef __DIMENSION_T_H__ 
 #define __DIMENSION_T_H__
@@ -367,6 +368,7 @@ GEN_HEAD_PTR_LIST(ptr_DIMENSION)
 #define min(x,y) (((x)<(y))?(x):(y)) 
 #endif 
 
+#ifndef IMPLEMENTATION_DIMENSION
 #define IMPLEMENTATION_DIMENSION()\
 \
 bool littleEndian=true;\
@@ -786,4 +788,5 @@ GEN_FUNC_PTR_LIST_FREE(ptr_DIMENSION){\
 }\
 \
 
+#endif /* IMPLEMENTATION_DIMENSION */