diff --git a/lib/internal.h b/lib/internal.h
index def344b7..12d1b2ac 100644
--- a/lib/internal.h
+++ b/lib/internal.h
@@ -89,6 +89,7 @@ int crypt_benchmark_pbkdf_internal(struct crypt_device *cd,
 				   struct crypt_pbkdf_type *pbkdf,
 				   size_t volume_key_size);
 const char *crypt_get_cipher_spec(struct crypt_device *cd);
+uint32_t pbkdf_adjusted_phys_memory_kb(void);
 
 /* Device backend */
 struct device;
diff --git a/lib/utils_benchmark.c b/lib/utils_benchmark.c
index 728e4dfd..a0326ce2 100644
--- a/lib/utils_benchmark.c
+++ b/lib/utils_benchmark.c
@@ -101,6 +101,7 @@ int crypt_benchmark_pbkdf(struct crypt_device *cd,
 {
 	int r, priority;
 	const char *kdf_opt;
+	uint32_t memory_kb;
 
 	if (!pbkdf || (!password && password_size))
 		return -EINVAL;
@@ -113,6 +114,14 @@ int crypt_benchmark_pbkdf(struct crypt_device *cd,
 
 	log_dbg(cd, "Running %s(%s) benchmark.", pbkdf->type, kdf_opt);
 
+	memory_kb = pbkdf_adjusted_phys_memory_kb();
+	if (memory_kb < pbkdf->max_memory_kb) {
+		log_dbg(cd, "Not enough physical memory detected, "
+			"PBKDF max memory decreased from %dkB to %dkB.",
+			pbkdf->max_memory_kb, memory_kb);
+		pbkdf->max_memory_kb = memory_kb;
+	}
+
 	crypt_process_priority(cd, &priority, true);
 	r = crypt_pbkdf_perf(pbkdf->type, pbkdf->hash, password, password_size,
 			     salt, salt_size, volume_key_size, pbkdf->time_ms,
diff --git a/lib/utils_pbkdf.c b/lib/utils_pbkdf.c
index d8f41c7d..b2d4fa0f 100644
--- a/lib/utils_pbkdf.c
+++ b/lib/utils_pbkdf.c
@@ -61,7 +61,7 @@ const struct crypt_pbkdf_type *crypt_get_pbkdf_type_params(const char *pbkdf_typ
 	return NULL;
 }
 
-static uint32_t adjusted_phys_memory(void)
+uint32_t pbkdf_adjusted_phys_memory_kb(void)
 {
 	uint64_t free_kb, memory_kb = crypt_getphysmemory_kb();
 
@@ -258,7 +258,7 @@ int init_pbkdf_type(struct crypt_device *cd,
 	}
 
 	if (cd_pbkdf->max_memory_kb) {
-		memory_kb = adjusted_phys_memory();
+		memory_kb = pbkdf_adjusted_phys_memory_kb();
 		if (cd_pbkdf->max_memory_kb > memory_kb) {
 			log_dbg(cd, "Not enough physical memory detected, "
 				"PBKDF max memory decreased from %dkB to %dkB.",