diff --git a/adb/set_verity_enable_state_service.cpp b/adb/set_verity_enable_state_service.cpp
index 253d14a0e..49e0363a1 100644
--- a/adb/set_verity_enable_state_service.cpp
+++ b/adb/set_verity_enable_state_service.cpp
@@ -93,21 +93,9 @@ static bool set_verity_enabled_state(int fd, const char* block_device, const cha
 /* Helper function to get A/B suffix, if any. If the device isn't
  * using A/B the empty string is returned. Otherwise either "_a",
  * "_b", ... is returned.
- *
- * Note that since sometime in O androidboot.slot_suffix is deprecated
- * and androidboot.slot should be used instead. Since bootloaders may
- * be out of sync with the OS, we check both and for extra safety
- * prepend a leading underscore if there isn't one already.
  */
 static std::string get_ab_suffix() {
-    std::string ab_suffix = android::base::GetProperty("ro.boot.slot_suffix", "");
-    if (ab_suffix == "") {
-        ab_suffix = android::base::GetProperty("ro.boot.slot", "");
-    }
-    if (ab_suffix.size() > 0 && ab_suffix[0] != '_') {
-        ab_suffix = std::string("_") + ab_suffix;
-    }
-    return ab_suffix;
+    return android::base::GetProperty("ro.boot.slot_suffix", "");
 }
 
 /* Use AVB to turn verity on/off */
diff --git a/fs_mgr/fs_mgr_slotselect.cpp b/fs_mgr/fs_mgr_slotselect.cpp
index 9ca15e237..33fd56240 100644
--- a/fs_mgr/fs_mgr_slotselect.cpp
+++ b/fs_mgr/fs_mgr_slotselect.cpp
@@ -21,19 +21,12 @@
 #include "fs_mgr.h"
 #include "fs_mgr_priv.h"
 
-// Returns "_a" or "_b" based on two possible values in kernel cmdline:
-//   - androidboot.slot = a or b OR
-//   - androidboot.slot_suffix = _a or _b
-// TODO: remove slot_suffix once it's deprecated.
+// Returns "_a" or "_b" based on androidboot.slot_suffix in kernel cmdline, or an empty string
+// if that parameter does not exist.
 std::string fs_mgr_get_slot_suffix() {
-    std::string slot;
     std::string ab_suffix;
 
-    if (fs_mgr_get_boot_config("slot", &slot)) {
-        ab_suffix = "_" + slot;
-    } else if (!fs_mgr_get_boot_config("slot_suffix", &ab_suffix)) {
-        ab_suffix = "";
-    }
+    fs_mgr_get_boot_config("slot_suffix", &ab_suffix);
     return ab_suffix;
 }