diff --git a/vlib/crypto/rand/rand.v b/vlib/crypto/rand/rand.v
index 9ad4602fc0..070355859d 100644
--- a/vlib/crypto/rand/rand.v
+++ b/vlib/crypto/rand/rand.v
@@ -4,6 +4,7 @@
 
 module rand
 
-const (
-	read_error = error('crypto.rand.read() error reading random bytes')
-)
+struct ReadError {
+	msg  string = 'crypto.rand.read() error reading random bytes'
+	code int
+}
diff --git a/vlib/crypto/rand/rand_darwin.c.v b/vlib/crypto/rand/rand_darwin.c.v
index c642ee4b28..a53198b578 100644
--- a/vlib/crypto/rand/rand_darwin.c.v
+++ b/vlib/crypto/rand/rand_darwin.c.v
@@ -12,10 +12,10 @@ fn C.SecRandomCopyBytes(rnd C.SecRandomRef, count size_t, bytes voidptr) int
 
 // read returns an array of `bytes_needed` random bytes read from the OS.
 pub fn read(bytes_needed int) ?[]byte {
-	mut buffer := []byte{ len: bytes_needed }
+	mut buffer := []byte{len: bytes_needed}
 	status := C.SecRandomCopyBytes(C.SecRandomRef(0), bytes_needed, buffer.data)
 	if status != 0 {
-		return read_error
+		return IError(&ReadError{})
 	}
 	return buffer
 }
diff --git a/vlib/crypto/rand/rand_linux.c.v b/vlib/crypto/rand/rand_linux.c.v
index 53ab02c5ac..d3da4e02a5 100644
--- a/vlib/crypto/rand/rand_linux.c.v
+++ b/vlib/crypto/rand/rand_linux.c.v
@@ -19,7 +19,7 @@ pub fn read(bytes_needed int) ?[]byte {
 		rbytes := unsafe { getrandom(batch_size, buffer + bytes_read) }
 		if rbytes == -1 {
 			unsafe { free(buffer) }
-			return read_error
+			return IError(&ReadError{})
 		}
 		bytes_read += rbytes
 	}
diff --git a/vlib/crypto/rand/rand_solaris.c.v b/vlib/crypto/rand/rand_solaris.c.v
index 09f1e43061..d2e84faf3c 100644
--- a/vlib/crypto/rand/rand_solaris.c.v
+++ b/vlib/crypto/rand/rand_solaris.c.v
@@ -23,7 +23,7 @@ pub fn read(bytes_needed int) ?[]byte {
 		rbytes := unsafe { getrandom(batch_size, buffer + bytes_read) }
 		if rbytes == -1 {
 			unsafe { free(buffer) }
-			return read_error
+			return IError(&ReadError{})
 		}
 		bytes_read += rbytes
 	}
diff --git a/vlib/crypto/rand/rand_windows.c.v b/vlib/crypto/rand/rand_windows.c.v
index 24ad4b9409..a64dfc5a40 100644
--- a/vlib/crypto/rand/rand_windows.c.v
+++ b/vlib/crypto/rand/rand_windows.c.v
@@ -19,7 +19,7 @@ pub fn read(bytes_needed int) ?[]byte {
 	// use bcrypt_use_system_preferred_rng because we passed null as algo
 	status := C.BCryptGenRandom(0, buffer.data, bytes_needed, bcrypt_use_system_preferred_rng)
 	if status != status_success {
-		return read_error
+		return IError(&ReadError{})
 	}
 	return buffer
 }