diff --git a/src/shared/efivars.c b/src/shared/efivars.c
index b82f74a45..2a925f397 100644
--- a/src/shared/efivars.c
+++ b/src/shared/efivars.c
@@ -87,12 +87,12 @@ static int read_flag(const char *varname) {
         return r;
 }
 
-int is_efi_secure_boot(void) {
-        return read_flag("SecureBoot");
+bool is_efi_secure_boot(void) {
+        return read_flag("SecureBoot") > 0;
 }
 
-int is_efi_secure_boot_setup_mode(void) {
-        return read_flag("SetupMode");
+bool is_efi_secure_boot_setup_mode(void) {
+        return read_flag("SetupMode") > 0;
 }
 
 int efi_reboot_to_firmware_supported(void) {
diff --git a/src/shared/efivars.h b/src/shared/efivars.h
index e796bf415..420013a61 100644
--- a/src/shared/efivars.h
+++ b/src/shared/efivars.h
@@ -33,8 +33,8 @@
 #define EFI_VARIABLE_RUNTIME_ACCESS     0x0000000000000004
 
 bool is_efi_boot(void);
-int is_efi_secure_boot(void);
-int is_efi_secure_boot_setup_mode(void);
+bool is_efi_secure_boot(void);
+bool is_efi_secure_boot_setup_mode(void);
 int efi_reboot_to_firmware_supported(void);
 int efi_get_reboot_to_firmware(void);
 int efi_set_reboot_to_firmware(bool value);