diff --git a/impl/src/layer2/packet_structs.c b/impl/src/layer2/packet_structs.c
index ffad7e2..e565200 100644
--- a/impl/src/layer2/packet_structs.c
+++ b/impl/src/layer2/packet_structs.c
@@ -94,28 +94,31 @@ void layer2_dump_packet_header(int level, const layer2_packet_header_t *header)
 	LOG(level, "  TX Seq. Nr:  %2u", header->tx_seq_nr);
 
 	ham64_addr_type_t addr_type;
+	const char* addr_type_string;
 	char addr_buf[HAM64_FMT_MAX_LEN];
 
 	addr_type = ham64_get_addr_type(&header->src_addr);
+	addr_type_string = ham64_addr_type_to_string(addr_type);
 	ham64_format(&header->src_addr, addr_buf);
 
 	if(addr_type == HAM64_ADDR_TYPE_CALLSIGN) {
 		char callsign[13];
 		ham64_decode_callsign(&header->src_addr, callsign);
-		LOG(level, "  Source Address: %s [%s] -> %s", addr_buf, ham64_addr_type_to_string(addr_type), callsign);
+		LOG(level, "  Source Address: %s [%s] -> %s", addr_buf, addr_type_string, callsign);
 	} else {
-		LOG(level, "  Source Address: %s [%s]", addr_buf, ham64_addr_type_to_string(addr_type));
+		LOG(level, "  Source Address: %s [%s]", addr_buf, addr_type_string);
 	}
 
 	addr_type = ham64_get_addr_type(&header->dst_addr);
+	addr_type_string = ham64_addr_type_to_string(addr_type);
 	ham64_format(&header->dst_addr, addr_buf);
 
 	if(addr_type == HAM64_ADDR_TYPE_CALLSIGN) {
 		char callsign[13];
 		ham64_decode_callsign(&header->dst_addr, callsign);
-		LOG(level, "  Dest. Address:  %s [%s] -> %s", addr_buf, ham64_addr_type_to_string(addr_type), callsign);
+		LOG(level, "  Dest. Address:  %s [%s] -> %s", addr_buf, addr_type_string, callsign);
 	} else {
-		LOG(level, "  Dest. Address:  %s [%s]", addr_buf, ham64_addr_type_to_string(addr_type));
+		LOG(level, "  Dest. Address:  %s [%s]", addr_buf, addr_type_string);
 	}
 
 }