diff --git a/src/fw/applib/health_service.h b/src/fw/applib/health_service.h
index 9c7ac579..a3986813 100644
--- a/src/fw/applib/health_service.h
+++ b/src/fw/applib/health_service.h
@@ -490,7 +490,7 @@ typedef struct {
 //!      exit, the UTC time of the end of the last record actually returned (i.e. start time of last
 //!      record + 60). If `time_end` on entry is somewhere in the middle of a minute interval, this
 //!      function behaves as if the caller passed in the end of that minute.
-//! @return Actual number of records returned. May be less then the maximum requested.
+//! @return Actual number of records returned. May be less than the maximum requested.
 //! @note If the return value is zero, `time_start` and `time_end` are meaningless.
 //!      It's not guaranteed that all records contain valid data, even if the return value is
 //!      greater than zero. Check `HealthMinuteData.is_invalid` to see if a given record contains
diff --git a/src/fw/services/normal/activity/activity_calculators.c b/src/fw/services/normal/activity/activity_calculators.c
index 38a51ab2..8205428c 100644
--- a/src/fw/services/normal/activity/activity_calculators.c
+++ b/src/fw/services/normal/activity/activity_calculators.c
@@ -105,7 +105,7 @@ uint32_t activity_private_compute_distance_mm(uint32_t steps, uint32_t ms) {
 //   active_ml = 0.2 * speed_m_per_min * minutes * weight_kg
 //
 // Converting to calories (5.01 calories per ml) and plugging in distance for speed * time, we get
-// the following. We will define walking as less then 4.5MPH (120 meters/minute)
+// the following. We will define walking as less than 4.5MPH (120 meters/minute)
 // for walking:
 //   active_cal = 0.1 * distance_m * weight_kg * 5.01
 //              = 0.501 * distance_m * weight_kg
diff --git a/tests/fw/drivers/test_flash_erase.c b/tests/fw/drivers/test_flash_erase.c
index 78247c40..7589f4ca 100644
--- a/tests/fw/drivers/test_flash_erase.c
+++ b/tests/fw/drivers/test_flash_erase.c
@@ -236,7 +236,7 @@ void test_flash_erase__96k_app_banks_1(void) {
 }
 
 void test_flash_erase__96k_app_banks_2(void) {
-  // App that's in an aligned bank but larger than than 64k
+  // App that's in an aligned bank but larger than 64k
   prv_test_erase_optimal_range(
       0, 0, 69 * 1024, 96 * 1024,
       (EraseCommand[]) {
@@ -262,7 +262,7 @@ void test_flash_erase__96k_app_banks_3(void) {
 }
 
 void test_flash_erase__96k_app_banks_4(void) {
-  // App that's in an unaligned bank but larger than than 64k
+  // App that's in an unaligned bank but larger than 64k
   prv_test_erase_optimal_range(
       32 * 1024, 32 * 1024, (32 + 71) * 1024, (32 + 96) * 1024,
       (EraseCommand[]) {
diff --git a/tests/fw/system/test_flash_region.c b/tests/fw/system/test_flash_region.c
index fab8aad9..5ba1a55a 100644
--- a/tests/fw/system/test_flash_region.c
+++ b/tests/fw/system/test_flash_region.c
@@ -148,7 +148,7 @@ void test_flash_region__erase_optimal_range_96k_app_banks(void) {
 
   s_command_list_index = 0;
 
-  // App that's in an aligned bank but larger than than 64k
+  // App that's in an aligned bank but larger than 64k
   flash_region_erase_optimal_range(0, 0, 69 * 1024, 96 * 1024);
 
   cl_assert_equal_i(s_command_list_index, 3);
@@ -185,7 +185,7 @@ void test_flash_region__erase_optimal_range_96k_app_banks(void) {
 
   s_command_list_index = 0;
 
-  // App that's in an unaligned bank but larger than than 64k
+  // App that's in an unaligned bank but larger than 64k
   flash_region_erase_optimal_range(32 * 1024, 32 * 1024, (32 + 71) * 1024, (32 + 96) * 1024);
 
   cl_assert_equal_i(s_command_list_index, 9);