diff --git a/libraries/Netdump/src/Netdump.cpp b/libraries/Netdump/src/Netdump.cpp
index 326f2eaa73..3fcf79298b 100644
--- a/libraries/Netdump/src/Netdump.cpp
+++ b/libraries/Netdump/src/Netdump.cpp
@@ -68,7 +68,7 @@ void Netdump::reset()
 
 void Netdump::printDump(Print& out, Packet::PacketDetail ndd, const Filter nf)
 {
-    out.printf("netDump starting\r\n");
+    out.printf_P(PSTR("netDump starting\r\n"));
     setCallback([&out, ndd, this](const Packet & ndp)
     {
         printDumpProcess(out, ndd, ndp);
@@ -140,7 +140,7 @@ void Netdump::writePcapHeader(Stream& s) const
 
 void Netdump::printDumpProcess(Print& out, Packet::PacketDetail ndd, const Packet& np) const
 {
-    out.printf_P(PSTR("%8d %s"), np.getTime(), np.toString(ndd).c_str());
+    out.printf_P(PSTR("%8lld %s"), np.getTime(), np.toString(ndd).c_str());
 }
 
 void Netdump::fileDumpProcess(File& outfile, const Packet& np) const
diff --git a/libraries/Netdump/src/NetdumpIP.cpp b/libraries/Netdump/src/NetdumpIP.cpp
index d66459d801..56936c744a 100644
--- a/libraries/Netdump/src/NetdumpIP.cpp
+++ b/libraries/Netdump/src/NetdumpIP.cpp
@@ -251,7 +251,7 @@ size_t NetdumpIP::printTo(Print& p)
             uint16_t bit = PP_NTOHS(reinterpret_cast<const uint16_t*>(rawip)[i]);
             if (bit || count0 < 0)
             {
-                n += p.printf("%x", bit);
+                n += p.printf_P(PSTR("%x"), bit);
                 if (count0 > 0)
                     // no more hiding 0
                 {
diff --git a/libraries/Netdump/src/NetdumpPacket.cpp b/libraries/Netdump/src/NetdumpPacket.cpp
index 4e2fcbaf6f..bb4e09920c 100644
--- a/libraries/Netdump/src/NetdumpPacket.cpp
+++ b/libraries/Netdump/src/NetdumpPacket.cpp
@@ -42,21 +42,21 @@ void Packet::printDetail(Print& out, const String& indent, const char* data, siz
         {
             end = size;
         }
-        out.printf("%s", indent.c_str());
+        out.printf_P(PSTR("%s"), indent.c_str());
         if (pd != PacketDetail::CHAR)
         {
             for (size_t i = start; i < end; i++)
             {
-                out.printf("%02x ", (unsigned char)data[i]);
+                out.printf_P(PSTR("%02x "), (unsigned char)data[i]);
             }
             for (size_t i = end; i < start + charCount; i++)
             {
-                out.print("   ");
+                out.printf_P(PSTR("   "));
             }
         }
         for (size_t i = start; i < end; i++)
         {
-            out.printf("%c", data[i] >= 32 && data[i] < 128 ? data[i] : '.');
+            out.printf_P(PSTR("%c"), data[i] >= 32 && data[i] < 128 ? data[i] : '.');
         }
         out.println();
 
@@ -253,7 +253,7 @@ void Packet::ICMPtoString(PacketDetail, StreamString& sstr) const
         default: sstr.printf_P(PSTR("type(0x%02x)"), getIcmpType()); break;
         }
     }
-    sstr.printf("\r\n");
+    sstr.printf_P(PSTR("\r\n"));
 }
 
 void Packet::IGMPtoString(PacketDetail, StreamString& sstr) const