diff --git a/src/main/blackbox/blackbox.c b/src/main/blackbox/blackbox.c
index d70fb399d2..db7f0e7fdc 100644
--- a/src/main/blackbox/blackbox.c
+++ b/src/main/blackbox/blackbox.c
@@ -1045,6 +1045,13 @@ static void writeInterframe(void)
     blackboxLoggedAnyFrames = true;
 }
 
+// for gcc9 (and maybe later), we warn on (mainly harmless) unaligned packed structure member pointer access
+// minimise the effect to the affected functions and compiler versions.
+#if (__GNUC__ >= 9)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
+#endif
+
 /* Write the contents of the global "slowHistory" to the log as an "S" frame. Because this data is logged so
  * infrequently, delta updates are not reasonable, so we log independent frames. */
 static void writeSlowFrame(void)
@@ -1131,6 +1138,10 @@ static void loadSlowState(blackboxSlowState_t *slow)
 
 }
 
+#if (__GNUC__ >= 9)
+#pragma GCC diagnostic pop
+#endif
+
 /**
  * If the data in the slow frame has changed, log a slow frame.
  *
diff --git a/src/main/telemetry/mavlink.c b/src/main/telemetry/mavlink.c
index 660e6f74c5..e9fd6931ad 100755
--- a/src/main/telemetry/mavlink.c
+++ b/src/main/telemetry/mavlink.c
@@ -75,6 +75,10 @@
 // until this is resolved in mavlink library - ignore -Wpedantic for mavlink code
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wpedantic"
+// For gcc9, the mavlink libary also fails on unaligned unaligned packed structure member pointer access
+#if (__GNUC__ >= 9)
+#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
+#endif
 #include "common/mavlink.h"
 #pragma GCC diagnostic pop