diff --git a/ProSystem.xcodeproj/project.pbxproj b/ProSystem.xcodeproj/project.pbxproj
index 8f999aa..ca651ba 100644
--- a/ProSystem.xcodeproj/project.pbxproj
+++ b/ProSystem.xcodeproj/project.pbxproj
@@ -546,7 +546,6 @@
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_GENERATE_DEBUGGING_SYMBOLS = YES;
-				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_SYMBOLS_PRIVATE_EXTERN = YES;
 				GCC_VERSION = com.apple.compilers.llvm.clang.1_0;
@@ -581,7 +580,6 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_GENERATE_DEBUGGING_SYMBOLS = YES;
-				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 3;
 				GCC_SYMBOLS_PRIVATE_EXTERN = YES;
 				GCC_VERSION = com.apple.compilers.llvm.clang.1_0;