diff --git a/userspace/engine/banned.h b/userspace/engine/banned.h
index 21dfdb2c..41690220 100644
--- a/userspace/engine/banned.h
+++ b/userspace/engine/banned.h
@@ -23,3 +23,24 @@ limitations under the License.
 
 #undef strcpy
 #define strcpy(a, b) BAN(strcpy)
+
+#undef vsprintf
+#define vsprintf(a, b, c) BAN(vsprintf)
+
+#undef sprintf
+#define sprintf(a, b, ...) BAN(sprintf)
+
+#undef strcat
+#define strcat(a, b) BAN(strcat)
+
+#undef strncat
+#define strncat(a, b, c) BAN(strncat)
+
+#undef strncpy
+#define strncpy(a, b, c) BAN(strncpy)
+
+#undef swprintf
+#define swprintf(a, b, c, ...) BAN(swprintf)
+
+#undef vswprintf
+#define vswprintf(a, b, c, d) BAN(vswprintf)
diff --git a/userspace/falco/logger.cpp b/userspace/falco/logger.cpp
index da4d6cf3..cf023a9b 100644
--- a/userspace/falco/logger.cpp
+++ b/userspace/falco/logger.cpp
@@ -131,12 +131,8 @@ void falco_logger::log(int priority, const string msg)
 		{
 			char buf[sizeof "YYYY-MM-DDTHH:MM:SS-0000"];
 			struct tm *gtm = std::gmtime(&result);
-			if(gtm == NULL ||
-			   (strftime(buf, sizeof(buf), "%FT%T%z", gtm) == 0))
-			{
-				sprintf(buf, "N/A");
-			}
-			else
+			if(gtm != NULL &&
+			   (strftime(buf, sizeof(buf), "%FT%T%z", gtm) != 0))
 			{
 				fprintf(stderr, "%s: %s", buf, msg.c_str());
 			}