cdromlib/cdnewlib.c | 6 +++---
 corelib/ncbierr.c   | 2 +-
 corelib/ncbisgml.c  | 8 ++++----
 demo/errhdr.c       | 2 +-
 4 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/cdromlib/cdnewlib.c b/cdromlib/cdnewlib.c
index 461292c..be4a2d6 100644
--- a/cdromlib/cdnewlib.c
+++ b/cdromlib/cdnewlib.c
@@ -2676,7 +2676,7 @@ static int CdDevice_FileBuildPath (CdDevice *cddev, char *fpath, const char *fdi
 			char volname[16];
 			volname[0] = '\0';
 			if (cddev->volume != NULL)
-				strncat(volname,cddev->volume->volume_name,sizeof volname);
+				strncat(volname,cddev->volume->volume_name,sizeof volname - 1);
 			else
 				sprintf(volname,"entrez%d",cddev->hint);
 			if (!FileBuildPath(fpath,volname,NULL))
@@ -2748,7 +2748,7 @@ static int CdDevice_Init (CdDevice *cddev)
 	memset((void*)&info,0,sizeof info);
 	fpath[0] = '\0';
 	if (cddev->inf.root !=NULL)
-		strncat(fpath,cddev->inf.root,sizeof fpath);
+		strncat(fpath,cddev->inf.root,sizeof fpath - 1);
 		
 	if (cddev->ins_volname)
 	{
@@ -2766,7 +2766,7 @@ static int CdDevice_Init (CdDevice *cddev)
 			{
 				fpath[0] = '\0';
 				if (cddev->inf.root !=NULL)
-					strncat(fpath,cddev->inf.root,sizeof fpath);
+					strncat(fpath,cddev->inf.root,sizeof fpath - 1);
 				sprintf(volname,"entrez%d",j+1);
 				FileBuildPath(fpath,volname,NULL);
 				if (CdTestPath(fpath,&info))
diff --git a/corelib/ncbierr.c b/corelib/ncbierr.c
index 0429d86..7b96a2e 100644
--- a/corelib/ncbierr.c
+++ b/corelib/ncbierr.c
@@ -952,7 +952,7 @@ static FILE * ErrMsgRoot_fopen (ErrMsgRoot *ctx)
 	if (FileLength(file)==0 || (fd = FileOpen(file,s_msg_mode)) == NULL)
           {
             strcpy(path,info->msgpath);
-            strncat(path,file,sizeof(path));
+            strncat(path,file,sizeof(path) - 1);
             fd = FileOpen(path,s_msg_mode);
           }
 
diff --git a/corelib/ncbisgml.c b/corelib/ncbisgml.c
index 99412be..a653aef 100644
--- a/corelib/ncbisgml.c
+++ b/corelib/ncbisgml.c
@@ -260,7 +260,7 @@ NLM_EXTERN char * LIBCALL  Nlm_Sgml2Ascii (const char *sgml, char *ascii, size_t
 			}
 			if (i >= num_sgml_entity)
 			{
-				char bad[SGML_ERROR_MSG_LIM];
+				char bad[SGML_ERROR_MSG_LIM + 2];
 				bad[0] = '\0';
 				strncat(bad,sgml,SGML_ERROR_MSG_LIM);
 				ErrPostEx(SEV_ERROR,E_SGML,3,"Unrecognized SGML entity &%s in [%s]",tbuf,bad);
@@ -279,7 +279,7 @@ NLM_EXTERN char * LIBCALL  Nlm_Sgml2Ascii (const char *sgml, char *ascii, size_t
 				from++;
 			if (*from == '\0')
 			{
-				char bad[SGML_ERROR_MSG_LIM];
+				char bad[SGML_ERROR_MSG_LIM + 2];
 				bad[0] = '\0';
 				strncat(bad,sgml,SGML_ERROR_MSG_LIM);
 				ErrPostEx(SEV_ERROR,E_SGML,2, "Unbalanced <> in SGML [%s]",bad);
@@ -335,7 +335,7 @@ NLM_EXTERN size_t LIBCALL  Nlm_Sgml2AsciiLen (const char *sgml)
 			}
 			if (i >= num_sgml_entity)
 			{
-				char bad[SGML_ERROR_MSG_LIM];
+				char bad[SGML_ERROR_MSG_LIM + 2];
 				bad[0] = '\0';
 				strncat(bad,sgml,SGML_ERROR_MSG_LIM);
 				ErrPostEx(SEV_ERROR,E_SGML,3,"Unrecognized SGML entity &%s in [%s]",tbuf,bad);
@@ -349,7 +349,7 @@ NLM_EXTERN size_t LIBCALL  Nlm_Sgml2AsciiLen (const char *sgml)
 				from++;
 			if (*from == '\0')
 			{
-				char bad[SGML_ERROR_MSG_LIM];
+				char bad[SGML_ERROR_MSG_LIM + 2];
 				bad[0] = '\0';
 				strncat(bad,sgml,SGML_ERROR_MSG_LIM);
 				ErrPostEx(SEV_ERROR,E_SGML,2,"Unbalanced <> in SGML [%s]",bad);
diff --git a/demo/errhdr.c b/demo/errhdr.c
index 01cd955..5081489 100644
--- a/demo/errhdr.c
+++ b/demo/errhdr.c
@@ -41,7 +41,7 @@ int main (int argc, char **argv)
 		else if (mod[0] == '\0')
 		{
 			char *p;
-			strncat(mod,argv[i],sizeof mod);
+			strncat(mod,argv[i],sizeof mod - 1);
 			if ((p = strstr(argv[i],".msg")) != NULL)
 				*p = '\0';
 		}