diff --git a/openssl/src/fips.rs b/openssl/src/fips.rs
index e6a2a4be48662a404d28d510f4bb839186fd9b34..a3be3219d6820d97e4cf81bbff888e10803645fa 100644
--- a/openssl/src/fips.rs
+++ b/openssl/src/fips.rs
@@ -10,6 +10,7 @@ use crate::error::ErrorStack;
 ///
 /// This corresponds to `FIPS_mode_set`.
 pub fn enable(enabled: bool) -> Result<(), ErrorStack> {
+    ffi::init();
     unsafe { cvt(ffi::FIPS_mode_set(enabled as _)).map(|_| ()) }
 }