diff --git a/src/libsodium/crypto_generichash/blake2b/ref/blake2.h b/src/libsodium/crypto_generichash/blake2b/ref/blake2.h
index ae93c1aa..50f664dd 100644
--- a/src/libsodium/crypto_generichash/blake2b/ref/blake2.h
+++ b/src/libsodium/crypto_generichash/blake2b/ref/blake2.h
@@ -61,7 +61,7 @@ typedef struct blake2b_state {
     uint8_t  last_node;
 } blake2b_state;
 
-#if defined(__IBMC__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
 #pragma pack()
 #else
 #pragma pack(pop)
diff --git a/src/libsodium/include/sodium/crypto_generichash_blake2b.h b/src/libsodium/include/sodium/crypto_generichash_blake2b.h
index fee9d8ad..1f322074 100644
--- a/src/libsodium/include/sodium/crypto_generichash_blake2b.h
+++ b/src/libsodium/include/sodium/crypto_generichash_blake2b.h
@@ -24,7 +24,7 @@ typedef struct CRYPTO_ALIGN(64) crypto_generichash_blake2b_state {
     unsigned char opaque[384];
 } crypto_generichash_blake2b_state;
 
-#if defined(__IBMC__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
 # pragma pack()
 #else
 # pragma pack(pop)