diff --git a/os/rt/include/chtrace.h b/os/rt/include/chtrace.h
index 2a0a71ed6..7926c517a 100644
--- a/os/rt/include/chtrace.h
+++ b/os/rt/include/chtrace.h
@@ -258,7 +258,7 @@ extern "C" {
   void chTraceWrite(void *up1, void *up2);
   void chTraceSuspendI(uint16_t mask);
   void chTraceSuspend(uint16_t mask);
-  void chTraceIResume(uint16_t mask);
+  void chTraceResumeI(uint16_t mask);
   void chTraceResume(uint16_t mask);
 #endif /* CH_DBG_TRACE_MASK != CH_DBG_TRACE_MASK_DISABLED */
 #ifdef __cplusplus
diff --git a/readme.txt b/readme.txt
index 2ffb4d1e1..3ee6b7db9 100644
--- a/readme.txt
+++ b/readme.txt
@@ -109,6 +109,8 @@
        ARMv7-M and ARMv8-M-ML.
 - NEW: On STM32WBxx added a check on STM32_LSI_ENABLE required by IWDG.
 - NEW: Added SPIv2 support also to STM32WB and STM32WL.
+- FIX: Fixed misspelled chTraceSuspendI() function name (bug #1209)
+       (backported to 21.11.2).
 - FIX: Fixed RT testbuild application broken (bug #1208)
        (backported to 20.3.5)(backported to 21.11.2).
 - FIX: Fixed PWR_CR2_USV not set in STM32L4+ mcuconf.h file (bug #1207)