diff --git a/src/assembler/parse_util.c b/src/assembler/parse_util.c
index 1adc9bc..bf8bc4e 100644
--- a/src/assembler/parse_util.c
+++ b/src/assembler/parse_util.c
@@ -15,8 +15,9 @@
 */
 bool parse_bool(bool *result, const ASMLine *line, const char *directive, bool auto_val)
 {
-    const char *arg = line->data + (DIRECTIVE_OFFSET(line, directive) + 1);
-    ssize_t len = line->length - (DIRECTIVE_OFFSET(line, directive) + 1);
+    size_t offset = DIRECTIVE_OFFSET(line, directive) + 1;
+    const char *arg = line->data + offset;
+    ssize_t len = line->length - offset;
 
     if (len <= 0 || len > 5)
         return false;
diff --git a/src/assembler/preprocessor.c b/src/assembler/preprocessor.c
index 5be423f..749af2e 100644
--- a/src/assembler/preprocessor.c
+++ b/src/assembler/preprocessor.c
@@ -16,6 +16,8 @@
 #include "../logging.h"
 #include "../util.h"
 
+#define MAX_REGION_SIZE 32
+
 /* Helper defines for preprocess() */
 
 #define SAVE_ARG(line, first, oldval, newval)                                 \
@@ -283,8 +285,23 @@ static ErrorInfo* build_asm_lines(
 */
 static bool parse_region_string(uint8_t *result, const ASMLine *line)
 {
-    char buffer[32];  // Longest region ("GG International") is 17 bytes
+    char buffer[MAX_REGION_SIZE];
+
+    size_t offset = DIRECTIVE_OFFSET(line, DIR_ROM_REGION) + 1;
+    const char *arg = line->data + offset;
+    ssize_t len = line->length - offset;
+
+    if (len <= 2 || len >= MAX_REGION_SIZE + 2)  // Account for double quotes
+        return false;
+    if (arg[0] != '"' || arg[len - 1] != '"')
+        return false;
+
+    strncpy(buffer, arg + 1, len - 2);
+    buffer[len - 2] = '\0';
 
+    uint8_t code = region_string_to_code(buffer);
+    if (code)
+        return (*result = code), true;
     return false;
 }
 
diff --git a/src/util.c b/src/util.c
index c199bb1..bb90c66 100644
--- a/src/util.c
+++ b/src/util.c
@@ -73,19 +73,19 @@ const char* region_code_to_string(uint8_t code)
 */
 uint8_t region_string_to_code(const char *name)
 {
-    if (!strcmp(name, "SMS ")) {
+    if (!strncmp(name, "SMS ", 4)) {
         name += 4;
-        if (strcmp(name, "Japan"))
+        if (!strcmp(name, "Japan"))
             return 3;
-        if (strcmp(name, "Export"))
+        if (!strcmp(name, "Export"))
             return 4;
-    } else if (!strcmp(name, "GG ")) {
+    } else if (!strncmp(name, "GG ", 3)) {
         name += 3;
-        if (strcmp(name, "Japan"))
+        if (!strcmp(name, "Japan"))
             return 5;
-        if (strcmp(name, "Export"))
+        if (!strcmp(name, "Export"))
             return 6;
-        if (strcmp(name, "International"))
+        if (!strcmp(name, "International"))
             return 7;
     }
     return 0;