diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index d3afc0a56..558eff6d5 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -451,7 +451,7 @@ void HelpMessageBox::printToConsole()
 void HelpMessageBox::showOrPrint()
 {
 #if defined(WIN32)
-        // On windows, show a message box, as there is no stderr/stdout in windowed applications
+        // On Windows, show a message box, as there is no stderr/stdout in windowed applications
         exec();
 #else
         // On other operating systems, print help text to console
diff --git a/src/test/bignum_tests.cpp b/src/test/bignum_tests.cpp
index 8620f81f1..744681871 100644
--- a/src/test/bignum_tests.cpp
+++ b/src/test/bignum_tests.cpp
@@ -12,8 +12,8 @@ BOOST_AUTO_TEST_SUITE(bignum_tests)
 // You should use it like this:
 //   NOINLINE void function() {...}
 #if defined(__GNUC__)
-// This also works and will be defined for any compiler implementing gcc
-// extensions, such as clang and icc.
+// This also works and will be defined for any compiler implementing GCC
+// extensions, such as Clang and ICC.
 #define NOINLINE __attribute__((noinline))
 #elif defined(_MSC_VER)
 #define NOINLINE __declspec(noinline)
@@ -48,7 +48,7 @@ BOOST_AUTO_TEST_SUITE(bignum_tests)
 // that -ftrapv will detect overflows.
 NOINLINE void mysetint64(CBigNum& num, int64 n)
 {
-	num.setint64(n);
+    num.setint64(n);
 }
 
 // For each number, we do 2 tests: one with inline code, then we reset the
diff --git a/src/util.h b/src/util.h
index 8244dcbaf..709b0e05b 100644
--- a/src/util.h
+++ b/src/util.h
@@ -12,7 +12,7 @@
 #include <sys/time.h>
 #include <sys/resource.h>
 #else
-typedef int pid_t; /* define for windows compatibility */
+typedef int pid_t; /* define for Windows compatibility */
 #endif
 #include <map>
 #include <vector>