diff --git a/env/posix/ocf_env.h b/env/posix/ocf_env.h
index 9220d1e..c82cf64 100644
--- a/env/posix/ocf_env.h
+++ b/env/posix/ocf_env.h
@@ -195,9 +195,18 @@ static inline void env_secure_free(const void *ptr, size_t size)
 	}
 }
 
+#include <sys/sysinfo.h>
+
 static inline uint64_t env_get_free_memory(void)
 {
-	return (uint64_t)(-1);
+	struct sysinfo info;
+	int ret;
+
+	ret = sysinfo(&info);
+	if (ret != 0)
+		return 0;
+
+	return (uint64_t)info.totalram * info.mem_unit;
 }
 
 /* ALLOCATOR */