diff --git a/protobuf.c b/protobuf.c
index e96bc78..df89284 100644
--- a/protobuf.c
+++ b/protobuf.c
@@ -81,15 +81,6 @@ int set_pb(FILE* fp, uint64_t* items_len, uint64_t struct_len, void* target) {
     return i;
 }
 
-uint8_t first_set(uint64_t n) {
-    uint8_t i = 0;
-    while(!(n & 1)) {
-        n >>= 1;
-        i++;
-    }
-    return i;
-}
-
 //uint64_t struct_size, uint32_t items_cnt, void* item_addr1, void* item_addr2...
 uint64_t* align_struct(uint64_t struct_size, uint32_t items_cnt, ...) {
     va_list list;
diff --git a/simple_protobuf.h b/simple_protobuf.h
index 15111e0..12d3044 100644
--- a/simple_protobuf.h
+++ b/simple_protobuf.h
@@ -11,7 +11,6 @@ typedef struct SIMPLE_PB SIMPLE_PB;
 
 SIMPLE_PB* get_pb(FILE* fp);
 int set_pb(FILE* fp, uint64_t* items_len, uint64_t struct_len, void* target);
-uint8_t first_set(uint64_t n);
 //uint64_t struct_size, uint32_t items_cnt, void* item_addr1, void* item_addr2...
 uint64_t* align_struct(uint64_t struct_size, uint32_t items_cnt, ...);