diff --git a/iterhash.cpp b/iterhash.cpp
index eedd5172..bf287164 100644
--- a/iterhash.cpp
+++ b/iterhash.cpp
@@ -152,7 +152,7 @@ template <class T, class BASE> void IteratedHashBase<T, BASE>::TruncatedFinal(by
 	this->Restart();		// reinit for next use
 }
 
-#ifdef __GNUC__
+#if defined(__GNUC__) || defined(__clang__)
 	template class IteratedHashBase<word64, HashTransformation>;
 	template class IteratedHashBase<word64, MessageAuthenticationCode>;
 
diff --git a/iterhash.h b/iterhash.h
index 5ab38825..d51e155b 100644
--- a/iterhash.h
+++ b/iterhash.h
@@ -179,7 +179,7 @@ protected:
 	FixedSizeAlignedSecBlock<T_HashWordType, T_BlockSize/sizeof(T_HashWordType), T_StateAligned> m_state;
 };
 
-#ifndef __GNUC__
+#if !defined(__GNUC__) && !defined(__clang__)
 	CRYPTOPP_DLL_TEMPLATE_CLASS IteratedHashBase<word64, HashTransformation>;
 	CRYPTOPP_STATIC_TEMPLATE_CLASS IteratedHashBase<word64, MessageAuthenticationCode>;