diff --git a/build.rs b/build.rs
index 2851fafdb8..9304bf12c4 100644
--- a/build.rs
+++ b/build.rs
@@ -284,6 +284,7 @@ const HURD: &str = "hurd";
 const ILLUMOS: &str = "illumos";
 const LINUX: &str = "linux";
 const NETBSD: &str = "netbsd";
+const NONE: &str = "none";
 const NTO: &str = "nto";
 const OPENBSD: &str = "openbsd";
 const REDOX: &str = "redox";
@@ -605,6 +606,12 @@ fn configure_cc(c: &mut cc::Build, target: &Target, c_root_dir: &Path, include_d
         let _ = c.flag(f);
     }
 
+    if target.os == NONE {
+        let _ = c.flag("-ffreestanding");
+        let _ = c.flag("-nostdlib");
+        let _ = c.define("RING_CORE_NOSTDLIBINC", "1");
+    }
+
     if APPLE_ABI.contains(&target.os.as_str()) {
         // ``-gfull`` is required for Darwin's |-dead_strip|.
         let _ = c.flag("-gfull");
diff --git a/include/ring-core/target.h b/include/ring-core/target.h
index fe40db7722..10ff27a4bc 100644
--- a/include/ring-core/target.h
+++ b/include/ring-core/target.h
@@ -49,6 +49,9 @@
 // Versions of GCC before 10.0 didn't define `__ILP32__` for all 32-bit targets.
 #elif defined(__MIPSEL__) || defined(__MIPSEB__) || defined(__PPC__) || defined(__powerpc__) || defined(__csky__) || defined(__XTENSA__)
 #define OPENSSL_32_BIT
+#elif defined(__riscv) && __riscv_xlen == 32
+#define OPENSSL_32_BIT
+#define OPENSSL_RISCV32
 #else
 #error "Unknown target CPU"
 #endif