diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6b0ae45a4..44c0033ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -143,7 +143,14 @@ add_executable(c3c
         src/compiler/llvm_codegen_c_abi_riscv.c
         src/compiler/llvm_codegen_c_abi_wasm.c)
 
-target_compile_options(c3c PRIVATE -Wsign-compare -Wno-unknown-warning-option -Wno-unused-result -Wno-maybe-uninitialized -Wimplicit-int -Werror -Wall -Wno-unknown-pragmas -Wextra -Wno-unused-function -Wno-unused-variable -Wno-unused-parameter)
+target_compile_options(c3c PRIVATE -Wsign-compare -Wimplicit-int -Werror -Wall
+        -Wempty-body -Wuninitialized -Wcast-function-type -Wclobbered
+        -Wignored-qualifiers -Wimplicit-fallthrough=3 -Wmisleading-indentation
+        -Wold-style-declaration -Woverride-init -Wstring-compare
+        -Wtype-limits -Wshift-negative-value
+        -Wmissing-field-initializers -Wmissing-parameter-type
+        -Wno-unknown-warning-option -Wno-unused-result -Wno-maybe-uninitialized
+        -Wno-unknown-pragmas -Wno-unused-function -Wno-unused-variable -Wno-unused-parameter)
 
 target_include_directories(c3c PRIVATE
         "${CMAKE_SOURCE_DIR}/src/")
diff --git a/src/build/project.c b/src/build/project.c
index 7ccad52ec..6ee6b9ef7 100644
--- a/src/build/project.c
+++ b/src/build/project.c
@@ -165,7 +165,7 @@ void project_add_target(Project *project, TomlValue *wrapped_table, const char *
 	if (arch_os_string)
 	{
 		ArchOsTarget arch_os = arch_os_target_from_string(arch_os_string);
-		if (arch_os < 0) error_exit("Error reading %s: %s target was not valid.", PROJECT_TOML, type);
+		if (arch_os == ARCH_OS_TARGET_DEFAULT) error_exit("Error reading %s: %s target was not valid.", PROJECT_TOML, type);
 		target->arch_os_target = arch_os;
 	}
 	long symtab_size = get_valid_integer(table, "symtab", type, false);