diff --git a/Transmission.xcodeproj/project.pbxproj b/Transmission.xcodeproj/project.pbxproj
index 7a2ab6e00..236a66b75 100644
--- a/Transmission.xcodeproj/project.pbxproj
+++ b/Transmission.xcodeproj/project.pbxproj
@@ -2226,6 +2226,7 @@
 				GCC_ENABLE_FIX_AND_CONTINUE = YES;
 				GCC_ENABLE_OBJC_EXCEPTIONS = YES;
 				GCC_GENERATE_DEBUGGING_SYMBOLS = YES;
+				GCC_INCREASE_PRECOMPILED_HEADER_SHARING = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_UNROLL_LOOPS = NO;
@@ -2235,6 +2236,7 @@
 				GCC_WARN_PROTOTYPE_CONVERSION = NO;
 				GCC_WARN_SHADOW = NO;
 				GCC_WARN_SIGN_COMPARE = NO;
+				GCC_WARN_TYPECHECK_CALLS_TO_PRINTF = YES;
 				GCC_WARN_UNUSED_FUNCTION = NO;
 				GCC_WARN_UNUSED_LABEL = NO;
 				GCC_WARN_UNUSED_PARAMETER = NO;
@@ -2363,12 +2365,14 @@
 				GCC_DEBUGGING_SYMBOLS = used;
 				GCC_ENABLE_OBJC_EXCEPTIONS = YES;
 				GCC_GENERATE_DEBUGGING_SYMBOLS = YES;
+				GCC_INCREASE_PRECOMPILED_HEADER_SHARING = YES;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_UNROLL_LOOPS = NO;
 				GCC_VERSION = 4.2;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = NO;
 				GCC_WARN_ABOUT_RETURN_TYPE = NO;
 				GCC_WARN_PROTOTYPE_CONVERSION = NO;
+				GCC_WARN_TYPECHECK_CALLS_TO_PRINTF = YES;
 				GCC_WARN_UNUSED_FUNCTION = NO;
 				GCC_WARN_UNUSED_PARAMETER = NO;
 				GCC_WARN_UNUSED_VARIABLE = NO;
@@ -2397,12 +2401,14 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_ENABLE_OBJC_EXCEPTIONS = YES;
 				GCC_GENERATE_DEBUGGING_SYMBOLS = YES;
+				GCC_INCREASE_PRECOMPILED_HEADER_SHARING = YES;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_UNROLL_LOOPS = NO;
 				GCC_VERSION = 4.2;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = NO;
 				GCC_WARN_ABOUT_RETURN_TYPE = NO;
 				GCC_WARN_PROTOTYPE_CONVERSION = NO;
+				GCC_WARN_TYPECHECK_CALLS_TO_PRINTF = YES;
 				GCC_WARN_UNUSED_FUNCTION = NO;
 				GCC_WARN_UNUSED_PARAMETER = NO;
 				GCC_WARN_UNUSED_VARIABLE = NO;