diff --git a/deps/v8/SConstruct b/deps/v8/SConstruct
index 022d7411da..597d033459 100644
--- a/deps/v8/SConstruct
+++ b/deps/v8/SConstruct
@@ -179,6 +179,9 @@ LIBRARY_FLAGS = {
       'CCFLAGS':      ['-ansi'],
     },
     'os:solaris': {
+      # On Solaris, to get isinf, INFINITY, fpclassify and other macros one
+      # needs to define __C99FEATURES__.
+      'CPPDEFINES': ['__C99FEATURES__'],
       'CPPPATH' : ['/usr/local/include'],
       'LIBPATH' : ['/usr/local/lib'],
       'CCFLAGS':      ['-ansi'],
diff --git a/deps/v8/src/platform.h b/deps/v8/src/platform.h
index 82e2e3c062..7156441b3a 100644
--- a/deps/v8/src/platform.h
+++ b/deps/v8/src/platform.h
@@ -44,12 +44,6 @@
 #ifndef V8_PLATFORM_H_
 #define V8_PLATFORM_H_
 
-#ifdef __sun
-// On Solaris, to get isinf, INFINITY, fpclassify and other macros one needs
-// to define this symbol
-#define __C99FEATURES__ 1
-#endif
-
 #define V8_INFINITY INFINITY
 
 // Windows specific stuff.