diff --git a/library/constant_time_internal.h b/library/constant_time_internal.h
index 50c08fa..d3d8945 100644
--- a/library/constant_time_internal.h
+++ b/library/constant_time_internal.h
@@ -291,6 +291,22 @@
                                           unsigned if1,
                                           unsigned if0);
 
+/** Choose between two mbedtls_ct_condition_t values.
+ *
+ * Functionally equivalent to:
+ *
+ * condition ? if1 : if0.
+ *
+ * \param condition     Condition to test.
+ * \param if1           Value to use if \p condition == MBEDTLS_CT_TRUE.
+ * \param if0           Value to use if \p condition == MBEDTLS_CT_FALSE.
+ *
+ * \return  \c if1 if \p condition == MBEDTLS_CT_TRUE, otherwise \c if0.
+ */
+static inline mbedtls_ct_condition_t mbedtls_ct_bool_if(mbedtls_ct_condition_t condition,
+                                                        mbedtls_ct_condition_t if1,
+                                                        mbedtls_ct_condition_t if0);
+
 #if defined(MBEDTLS_BIGNUM_C)
 
 /** Choose between two mbedtls_mpi_uint values.
@@ -327,6 +343,23 @@
  */
 static inline unsigned mbedtls_ct_uint_if_else_0(mbedtls_ct_condition_t condition, unsigned if1);
 
+/** Choose between an mbedtls_ct_condition_t and 0.
+ *
+ * Functionally equivalent to:
+ *
+ * condition ? if1 : 0.
+ *
+ * Functionally equivalent to mbedtls_ct_bool_if(condition, if1, 0) but
+ * results in smaller code size.
+ *
+ * \param condition     Condition to test.
+ * \param if1           Value to use if \p condition == MBEDTLS_CT_TRUE.
+ *
+ * \return  \c if1 if \p condition == MBEDTLS_CT_TRUE, otherwise 0.
+ */
+static inline mbedtls_ct_condition_t mbedtls_ct_bool_if_else_0(mbedtls_ct_condition_t condition,
+                                                               mbedtls_ct_condition_t if1);
+
 /** Choose between a size_t value and 0.
  *
  * Functionally equivalent to: