diff --git a/src/unix/internal.h b/src/unix/internal.h
index 7729ab8d..a0846970 100644
--- a/src/unix/internal.h
+++ b/src/unix/internal.h
@@ -95,8 +95,7 @@ int uv__pthread_sigmask(int how, const sigset_t* set, sigset_t* oset);
  */
 #if defined(__clang__) ||                                                     \
     defined(__GNUC__) ||                                                      \
-    defined(__INTEL_COMPILER) ||                                              \
-    defined(__SUNPRO_C)
+    defined(__INTEL_COMPILER)
 # define UV_DESTRUCTOR(declaration) __attribute__((destructor)) declaration
 # define UV_UNUSED(declaration)     __attribute__((unused)) declaration
 #else
diff --git a/test/task.h b/test/task.h
index 282c02d5..8462e0dd 100644
--- a/test/task.h
+++ b/test/task.h
@@ -174,8 +174,7 @@ extern int snprintf(char*, size_t, const char*, ...);
 
 #if defined(__clang__) ||                                \
     defined(__GNUC__) ||                                 \
-    defined(__INTEL_COMPILER) ||                         \
-    defined(__SUNPRO_C)
+    defined(__INTEL_COMPILER)
 # define UNUSED __attribute__((unused))
 #else
 # define UNUSED