diff --git a/src/obidms.c b/src/obidms.c
index b025a44..595dfa5 100644
--- a/src/obidms.c
+++ b/src/obidms.c
@@ -121,7 +121,7 @@ OBIDMS_p obi_create_dms(const char* dms_name)
 		return NULL;
 
 	// Try to create the directory
-	if (mkdir(directory_name, 0x777) < 0)
+	if (mkdir(directory_name, 00777) < 0)
 	{
 		if (errno == EEXIST)
 			obi_set_errno(OBIDMS_EXIST_ERROR);
diff --git a/src/obidmscolumndir.c b/src/obidmscolumndir.c
index 6f7dcd0..6a347e2 100644
--- a/src/obidmscolumndir.c
+++ b/src/obidmscolumndir.c
@@ -165,7 +165,7 @@ OBIDMS_column_directory_p obi_create_column_directory(OBIDMS_p dms, const char*
 	}
 
 	// Try to create the directory
-	if (mkdirat(dms_file_descriptor, column_directory_name, 0x777) < 0)
+	if (mkdirat(dms_file_descriptor, column_directory_name, 00777) < 0)
 	{
 		if (errno == EEXIST)
 			obi_set_errno(OBICOLDIR_EXIST_ERROR);