diff --git a/src/gb/gb.h b/src/gb/gb.h
index 84bbc2e0e..793011028 100644
--- a/src/gb/gb.h
+++ b/src/gb/gb.h
@@ -5613,7 +5613,7 @@ gb_inline b32 gb_path_is_absolute(char const *path) {
 	b32 result = false;
 	GB_ASSERT(path != NULL);
 #if defined(GB_SYSTEM_WINDOWS)
-	result == (gb_strlen(path) > 2) &&
+	result = (gb_strlen(path) > 2) &&
 	          gb_char_is_alpha(path[0]) &&
 	          (path[1] == ':' && path[2] == GB_PATH_SEPARATOR);
 #else
diff --git a/src/main.cpp b/src/main.cpp
index ba2718194..c4b4441d8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2743,10 +2743,11 @@ gb_internal int print_show_help(String const arg0, String command, String option
 
 	if (check) {
 		if (print_flag("-collection:<name>=<filepath>")) {
-			print_usage_line(2, "Defines a library collection used for imports.");
+			print_usage_line(2, "Defines a library collection used for imports and foreign imports.");
 			print_usage_line(2, "Example: -collection:shared=dir/to/shared");
 			print_usage_line(2, "Usage in Code:");
 				print_usage_line(3, "import \"shared:foo\"");
+				print_usage_line(3, "foreign import lib \"shared:libfoo.a\"");
 		}
 
 		if (print_flag("-custom-attribute:<string>")) {
diff --git a/src/parser.cpp b/src/parser.cpp
index 0e7ec1d60..64112e085 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -6054,6 +6054,19 @@ gb_internal bool is_import_path_valid(String const &path) {
 	return false;
 }
 
+gb_internal bool is_import_path_absolute(String const &path) {
+	if (path.len > 0 && path[0] == '/') {
+		return true;
+	}
+	if (path.len > 2 &&
+	    gb_char_is_alpha(path[0]) &&
+	    path[1] == ':' &&
+	    (path[2] == '/' || path[2] == '\\')) {
+		return true;
+	}
+	return false;
+}
+
 gb_internal bool is_build_flag_path_valid(String const &path) {
 	if (path.len > 0) {
 		u8 *start = path.text;
@@ -6116,12 +6129,13 @@ gb_internal bool determine_path_from_string(BlockingMutex *file_mutex, Ast *node
 	do_warning = &syntax_warning;
 	if (use_check_errors) {
 		do_error = &error;
-		do_error = &warning;
+		do_warning = &warning;
 	}
 
 	// NOTE(bill): if file_mutex == nullptr, this means that the code is used within the semantics stage
 
 	String collection_name = {};
+	bool is_import_decl_path = node->kind == Ast_ImportDecl || node->kind == Ast_ForeignImportDecl;
 
 	isize colon_pos = -1;
 	for (isize j = 0; j < original_string.len; j++) {
@@ -6134,11 +6148,13 @@ gb_internal bool determine_path_from_string(BlockingMutex *file_mutex, Ast *node
 	bool has_windows_drive = false;
 #if defined(GB_SYSTEM_WINDOWS)
 	if (file_mutex == nullptr) {
-		if (colon_pos == 1 && original_string.len > 2) {
-			if (original_string[2] == '/' || original_string[2] == '\\') {
-				colon_pos = -1;
-				has_windows_drive = true;
-			}
+		if (!is_import_decl_path &&
+		    colon_pos == 1 &&
+		    original_string.len > 2 &&
+		    gb_char_is_alpha(original_string[0]) &&
+		    (original_string[2] == '/' || original_string[2] == '\\')) {
+			colon_pos = -1;
+			has_windows_drive = true;
 		}
 
 		for (isize i = 0; i < original_string.len; i++) {
@@ -6162,6 +6178,10 @@ gb_internal bool determine_path_from_string(BlockingMutex *file_mutex, Ast *node
 		file_str = original_string;
 	}
 
+	if (is_import_decl_path && is_import_path_absolute(file_str)) {
+		do_error(node, "Invalid import path: '%.*s'", LIT(file_str));
+		return false;
+	}
 
 	if (has_windows_drive) {
 		String sub_file_path = substring(file_str, 3, file_str.len);
@@ -6234,8 +6254,7 @@ gb_internal bool determine_path_from_string(BlockingMutex *file_mutex, Ast *node
 	if (has_windows_drive) {
 		*path = file_str;
 	} else {
-		bool ok = false;
-		String fullpath = string_trim_whitespace(get_fullpath_relative(permanent_allocator(), base_dir, file_str, &ok));
+		String fullpath = string_trim_whitespace(get_fullpath_relative(permanent_allocator(), base_dir, file_str, nullptr));
 		*path = fullpath;
 	}
 	return true;
@@ -6287,6 +6306,12 @@ gb_internal void parse_setup_file_decls(Parser *p, AstFile *f, String const &bas
 			ast_node(id, ImportDecl, node);
 
 			String original_string = string_trim_whitespace(string_value_from_token(f, id->relpath));
+			if (is_import_path_absolute(original_string)) {
+				syntax_error(node, "Invalid import path: '%.*s'", LIT(original_string));
+				decls[i] = ast_bad_decl(f, id->relpath, id->relpath);
+				continue;
+			}
+
 			String import_path = {};
 			bool ok = determine_path_from_string(&p->file_decl_mutex, node, base_dir, original_string, &import_path);
 			if (!ok) {
@@ -6313,6 +6338,12 @@ gb_internal void parse_setup_file_decls(Parser *p, AstFile *f, String const &bas
 				GB_ASSERT(fp->kind == Ast_BasicLit);
 				Token fp_token = fp->BasicLit.token;
 				String file_str = string_trim_whitespace(string_value_from_token(f, fp_token));
+				if (is_import_path_absolute(file_str)) {
+					syntax_error(node, "Invalid import path: '%.*s'", LIT(file_str));
+					decls[i] = ast_bad_decl(f, fp_token, fp_token);
+					goto end;
+				}
+
 				String fullpath = file_str;
 				if (!is_arch_wasm() || string_ends_with(fullpath, str_lit(".o"))) {
 					String foreign_path = {};
@@ -7100,4 +7131,3 @@ gb_internal ParseFileError parse_packages(Parser *p, String init_filename) {
 
 	return ParseFile_None;
 }
-