diff --git a/QCBOR.xcodeproj/project.pbxproj b/QCBOR.xcodeproj/project.pbxproj
index 672c33a..dd1c21a 100644
--- a/QCBOR.xcodeproj/project.pbxproj
+++ b/QCBOR.xcodeproj/project.pbxproj
@@ -28,14 +28,14 @@
 
 /* Begin PBXFileReference section */
 		E776E07C214ADF7F00E67947 /* QCBOR */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = QCBOR; sourceTree = BUILT_PRODUCTS_DIR; };
-		E776E08C214AE07400E67947 /* qcbor_encode.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = qcbor_encode.c; path = src/qcbor_encode.c; sourceTree = "<group>"; };
+		E776E08C214AE07400E67947 /* qcbor_encode.c */ = {isa = PBXFileReference; fileEncoding = 4; indentWidth = 3; lastKnownFileType = sourcecode.c.c; name = qcbor_encode.c; path = src/qcbor_encode.c; sourceTree = "<group>"; tabWidth = 3; };
 		E776E08D214AE07500E67947 /* UsefulBuf.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = UsefulBuf.c; path = src/UsefulBuf.c; sourceTree = "<group>"; };
 		E776E08E214AE07500E67947 /* qcbor_decode.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = qcbor_decode.c; path = src/qcbor_decode.c; sourceTree = "<group>"; };
 		E776E093214AE08B00E67947 /* qcbor.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = qcbor.h; path = inc/qcbor.h; sourceTree = "<group>"; };
 		E776E094214AE09700E67947 /* UsefulBuf.h */ = {isa = PBXFileReference; fileEncoding = 4; indentWidth = 3; lastKnownFileType = sourcecode.c.h; name = UsefulBuf.h; path = inc/UsefulBuf.h; sourceTree = "<group>"; tabWidth = 3; };
 		E776E096214AE0C700E67947 /* cmd_line_main.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = cmd_line_main.c; sourceTree = "<group>"; };
 		E776E09B214AEEEA00E67947 /* basic_test.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = basic_test.h; path = test/basic_test.h; sourceTree = "<group>"; };
-		E776E09C214AEEEA00E67947 /* basic_test.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; name = basic_test.c; path = test/basic_test.c; sourceTree = "<group>"; };
+		E776E09C214AEEEA00E67947 /* basic_test.c */ = {isa = PBXFileReference; fileEncoding = 4; indentWidth = 3; lastKnownFileType = sourcecode.c.c; name = basic_test.c; path = test/basic_test.c; sourceTree = "<group>"; tabWidth = 3; };
 		E776E161214EE19C00E67947 /* README.md */ = {isa = PBXFileReference; lastKnownFileType = net.daringfireball.markdown; path = README.md; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
@@ -205,7 +205,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_OPTIMIZATION_LEVEL = s;
+				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
 					"$(inherited)",
@@ -262,6 +262,7 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;