diff --git a/src/PDB/writePDB.c b/src/PDB/writePDB.c
index 960b472..427ffd9 100644
--- a/src/PDB/writePDB.c
+++ b/src/PDB/writePDB.c
@@ -415,8 +415,8 @@ strcat(line," ");
 /*
 pdb_a[2].b[1].c[7]	=	1;   chainID        	(22)
 */
-if((a[0].cID!='\0')&&(a[0].cID!=NULL)){strncat(line,a[0].cID,1);}
-else if((r[0].cID!='\0')&&(a[0].cID!=NULL)){strncat(line,r[0].cID,1);}
+if(a[0].cID!=NULL){strncat(line,a[0].cID,1);}
+else if(a[0].cID!=NULL){strncat(line,r[0].cID,1);}
 else{strcat(line," ");}
 /*
 pdb_a[2].b[1].c[8]	=	4;   resSeq		(23-26)
@@ -429,7 +429,7 @@ strcat(line,tmp);
 /*
 pdb_a[2].b[1].c[9]	=	1;   iCode		(27)
 */
-if(r[0].IC=='\0'){strcat(line," ");}
+if(r[0].IC==NULL){strcat(line," ");}
 else{strncat(line,r[0].IC,1);}
 /*
 pdb_a[2].b[1].c[10]	=	3;   N/A		(28-30)