diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23907322..582e0efb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -65,7 +65,7 @@ endif()
 
 #Fixes GetActiveProcessorCount on MinGW
 if(MINGW)
-target_compile_definitions(libninja PRIVATE _WIN32_WINNT=0x0601)
+target_compile_definitions(libninja PRIVATE _WIN32_WINNT=0x0601 __USE_MINGW_ANSI_STDIO=1)
 endif()
 
 # Main executable is library plus main() function.
diff --git a/configure.py b/configure.py
index 1d6ee7dd..7d8ce904 100755
--- a/configure.py
+++ b/configure.py
@@ -356,7 +356,7 @@ else:
     except:
         pass
     if platform.is_mingw():
-        cflags += ['-D_WIN32_WINNT=0x0601']
+        cflags += ['-D_WIN32_WINNT=0x0601', '-D__USE_MINGW_ANSI_STDIO=1']
     ldflags = ['-L$builddir']
     if platform.uses_usr_local():
         cflags.append('-I/usr/local/include')