diff --git a/src/runtime/c/gu/hash.h b/src/runtime/c/gu/hash.h
index da612f3f4..fb688af01 100644
--- a/src/runtime/c/gu/hash.h
+++ b/src/runtime/c/gu/hash.h
@@ -31,10 +31,10 @@ struct GuHasher {
 };
 
 
-GU_API_DATA GuHasher gu_int_hasher[1];
+GU_API_DATA_DECL GuHasher gu_int_hasher[1];
 
-GU_API_DATA GuHasher gu_addr_hasher[1];
+GU_API_DATA_DECL GuHasher gu_addr_hasher[1];
 
-GU_API_DATA GuHasher gu_word_hasher[1];
+GU_API_DATA_DECL GuHasher gu_word_hasher[1];
 
 #endif // GU_HASH_H_
diff --git a/src/runtime/c/gu/string.h b/src/runtime/c/gu/string.h
index 2bf1aef45..17b932397 100644
--- a/src/runtime/c/gu/string.h
+++ b/src/runtime/c/gu/string.h
@@ -58,9 +58,9 @@ gu_string_is_prefix(GuString s1, GuString s2);
 
 #if defined(GU_FUN_H_) && !defined(GU_STRING_H_FUN_)
 #define GU_STRING_H_FUN_
-GU_API_DATA GuEquality gu_string_equality[1];
+GU_API_DATA_DECL GuEquality gu_string_equality[1];
 
-GU_API_DATA GuOrder gu_string_order[1];
+GU_API_DATA_DECL GuOrder gu_string_order[1];
 #endif
 
 #if defined(GU_HASH_H_) && !defined(GU_STRING_H_HASH_)
diff --git a/src/runtime/c/gu/variant.h b/src/runtime/c/gu/variant.h
index 8e7741694..ec057faa4 100644
--- a/src/runtime/c/gu/variant.h
+++ b/src/runtime/c/gu/variant.h
@@ -97,7 +97,7 @@ gu_variant_from_ptr(const void* p)
 	return (uintptr_t) p;
 }
 
-GU_API_DATA const GuVariant gu_null_variant;
+GU_API_DATA_DECL const GuVariant gu_null_variant;
 
 static inline bool
 gu_variant_is_null(GuVariant v) {