diff --git a/src/processor/exploitability_unittest.cc b/src/processor/exploitability_unittest.cc
index db3dc687..b5e7feef 100644
--- a/src/processor/exploitability_unittest.cc
+++ b/src/processor/exploitability_unittest.cc
@@ -37,12 +37,12 @@
 #include "google_breakpad/processor/basic_source_line_resolver.h"
 #include "google_breakpad/processor/minidump_processor.h"
 #include "google_breakpad/processor/process_state.h"
-#ifndef _WIN32
+#ifdef __linux__
 #include "processor/exploitability_linux.h"
-#endif  // _WIN32
+#endif  // __linux__
 #include "processor/simple_symbol_supplier.h"
 
-#ifndef _WIN32
+#ifdef __linux__
 namespace google_breakpad {
 
 class ExploitabilityLinuxTest : public ExploitabilityLinux {
@@ -64,15 +64,15 @@ class ExploitabilityLinuxTestMinidumpContext : public MinidumpContext {
 };
 
 }  // namespace google_breakpad
-#endif  // _WIN32
+#endif  // __linux__
 
 namespace {
 
 using google_breakpad::BasicSourceLineResolver;
-#ifndef _WIN32
+#ifdef __linux__
 using google_breakpad::ExploitabilityLinuxTest;
 using google_breakpad::ExploitabilityLinuxTestMinidumpContext;
-#endif  // _WIN32
+#endif  // __linux__
 using google_breakpad::MinidumpProcessor;
 using google_breakpad::ProcessState;
 using google_breakpad::SimpleSymbolSupplier;
@@ -171,7 +171,7 @@ TEST(ExploitabilityTest, TestLinuxEngine) {
             ExploitabilityFor("linux_executable_heap.dmp"));
   ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH,
             ExploitabilityFor("linux_jmp_to_module_not_exe_region.dmp"));
-#ifndef _WIN32
+#ifdef __linux__
   ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH,
             ExploitabilityFor("linux_write_to_nonwritable_module.dmp"));
   ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH,
@@ -182,10 +182,10 @@ TEST(ExploitabilityTest, TestLinuxEngine) {
             ExploitabilityFor("linux_write_to_outside_module_via_math.dmp"));
   ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING,
             ExploitabilityFor("linux_write_to_under_4k.dmp"));
-#endif  // _WIN32
+#endif  // __linux__
 }
 
-#ifndef _WIN32
+#ifdef __linux__
 TEST(ExploitabilityLinuxUtilsTest, DisassembleBytesTest) {
   ASSERT_FALSE(ExploitabilityLinuxTest::DisassembleBytes("", NULL, 0, 5, NULL));
   uint8_t bytes[6] = {0xc7, 0x0, 0x5, 0x0, 0x0, 0x0};
@@ -299,6 +299,6 @@ TEST(ExploitabilityLinuxUtilsTest, CalculateAddressTest) {
                                                          context,
                                                          &write_address));
 }
-#endif  // _WIN32
+#endif  // __linux__
 
 }  // namespace