diff --git a/minmea.h b/minmea.h
index 91568f7..893e6c8 100644
--- a/minmea.h
+++ b/minmea.h
@@ -260,6 +260,10 @@ static inline float minmea_tocoord(const struct minmea_float *f)
 {
     if (f->scale == 0)
         return NAN;
+    if (f->scale  > (INT_LEAST32_MAX / 100))
+        return NAN;
+    if (f->scale < (INT_LEAST32_MIN / 100))
+        return NAN;
     int_least32_t degrees = f->value / (f->scale * 100);
     int_least32_t minutes = f->value % (f->scale * 100);
     return (float) degrees + (float) minutes / (60 * f->scale);