diff --git a/src/libsodium/crypto_generichash/blake2b/ref/blake2.h b/src/libsodium/crypto_generichash/blake2b/ref/blake2.h
index 50f664dd..eeccdcc9 100644
--- a/src/libsodium/crypto_generichash/blake2b/ref/blake2.h
+++ b/src/libsodium/crypto_generichash/blake2b/ref/blake2.h
@@ -32,10 +32,12 @@ enum blake2b_constant {
     BLAKE2B_PERSONALBYTES = 16
 };
 
-#if defined(__IBMC__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
-#pragma pack(1)
+#ifdef __IBMC__
+# pragma pack(1)
+#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+# pragma pack(1)
 #else
-#pragma pack(push, 1)
+# pragma pack(push, 1)
 #endif
 
 typedef struct blake2b_param_ {
@@ -61,10 +63,12 @@ typedef struct blake2b_state {
     uint8_t  last_node;
 } blake2b_state;
 
-#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
-#pragma pack()
+#ifdef __IBMC__
+# pragma pack(pop)
+#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+# pragma pack()
 #else
-#pragma pack(pop)
+# pragma pack(pop)
 #endif
 
 /* Streaming API */
diff --git a/src/libsodium/include/sodium/crypto_generichash_blake2b.h b/src/libsodium/include/sodium/crypto_generichash_blake2b.h
index 1f322074..ae3b52f7 100644
--- a/src/libsodium/include/sodium/crypto_generichash_blake2b.h
+++ b/src/libsodium/include/sodium/crypto_generichash_blake2b.h
@@ -14,7 +14,9 @@
 extern "C" {
 #endif
 
-#if defined(__IBMC__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+#ifdef __IBMC__
+# pragma pack(1)
+#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
 # pragma pack(1)
 #else
 # pragma pack(push, 1)
@@ -24,7 +26,9 @@ typedef struct CRYPTO_ALIGN(64) crypto_generichash_blake2b_state {
     unsigned char opaque[384];
 } crypto_generichash_blake2b_state;
 
-#if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
+#ifdef __IBMC__
+# pragma pack(pop)
+#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
 # pragma pack()
 #else
 # pragma pack(pop)