diff --git a/platform/robert/boot/waftools/binary_header.py b/platform/robert/boot/waftools/binary_header.py
index 09790729..e0104bfc 100644
--- a/platform/robert/boot/waftools/binary_header.py
+++ b/platform/robert/boot/waftools/binary_header.py
@@ -97,7 +97,7 @@ def process_binary_header(self):
     sparse length encoding (see waftools/sparse_length_encoding.py).
 
     The name of the array variable defaults to the source file name with all
-    characters that are invaid C identifiers replaced with underscores. The name
+    characters that are invalid C identifiers replaced with underscores. The name
     can be explicitly specified by setting the *array_name* parameter.
 
     This method overrides the processing by
diff --git a/platform/silk/boot/waftools/binary_header.py b/platform/silk/boot/waftools/binary_header.py
index 827c11e5..cb52b896 100644
--- a/platform/silk/boot/waftools/binary_header.py
+++ b/platform/silk/boot/waftools/binary_header.py
@@ -85,7 +85,7 @@ def process_binary_header(self):
     file is treated as a raw binary file.
 
     The name of the array variable defaults to the source file name with all
-    characters that are invaid C identifiers replaced with underscores. The name
+    characters that are invalid C identifiers replaced with underscores. The name
     can be explicitly specified by setting the *array_name* parameter.
 
     This method overrides the processing by
diff --git a/platform/snowy/boot/waftools/binary_header.py b/platform/snowy/boot/waftools/binary_header.py
index e8256534..3f6543b1 100644
--- a/platform/snowy/boot/waftools/binary_header.py
+++ b/platform/snowy/boot/waftools/binary_header.py
@@ -84,7 +84,7 @@ def process_binary_header(self):
     file is treated as a raw binary file.
 
     The name of the array variable defaults to the source file name with all
-    characters that are invaid C identifiers replaced with underscores. The name
+    characters that are invalid C identifiers replaced with underscores. The name
     can be explicitly specified by setting the *array_name* parameter.
 
     This method overrides the processing by
diff --git a/platform/tintin/boot/waftools/binary_header.py b/platform/tintin/boot/waftools/binary_header.py
index 827c11e5..cb52b896 100644
--- a/platform/tintin/boot/waftools/binary_header.py
+++ b/platform/tintin/boot/waftools/binary_header.py
@@ -85,7 +85,7 @@ def process_binary_header(self):
     file is treated as a raw binary file.
 
     The name of the array variable defaults to the source file name with all
-    characters that are invaid C identifiers replaced with underscores. The name
+    characters that are invalid C identifiers replaced with underscores. The name
     can be explicitly specified by setting the *array_name* parameter.
 
     This method overrides the processing by
diff --git a/src/fw/apps/demo_apps/test_sys_timer_app.c b/src/fw/apps/demo_apps/test_sys_timer_app.c
index 6d7564ec..860d3082 100644
--- a/src/fw/apps/demo_apps/test_sys_timer_app.c
+++ b/src/fw/apps/demo_apps/test_sys_timer_app.c
@@ -315,7 +315,7 @@ void stuck_callback_menu_cb(int index, void *ctx) {
 }
 
 // =================================================================================
-void invaid_timer_id_menu_cb(int index, void *ctx) {
+void invalid_timer_id_menu_cb(int index, void *ctx) {
   void *cb_data = 0;
   uint32_t zero_flags = 0;
 
@@ -405,7 +405,7 @@ static void prv_window_load(Window *window) {
       .callback = stuck_callback_menu_cb
     }, {
       .title = "invalid timer ID",
-      .callback = invaid_timer_id_menu_cb
+      .callback = invalid_timer_id_menu_cb
     }, {
       .title = "RT: sch 1 sec from cb",
       .callback = reg_timer_schedule_1sec_from_cb_menu_cb
diff --git a/waftools/binary_header.py b/waftools/binary_header.py
index af980654..98ae90cd 100644
--- a/waftools/binary_header.py
+++ b/waftools/binary_header.py
@@ -109,7 +109,7 @@ def process_binary_header(self):
     sparse length encoding (see waftools/sparse_length_encoding.py).
 
     The name of the array variable defaults to the source file name with all
-    characters that are invaid C identifiers replaced with underscores. The name
+    characters that are invalid C identifiers replaced with underscores. The name
     can be explicitly specified by setting the *array_name* parameter.
 
     This method overrides the processing by