diff --git a/src/openrct2/core/String.cpp b/src/openrct2/core/String.cpp
index 8b45f6e928..636409629c 100644
--- a/src/openrct2/core/String.cpp
+++ b/src/openrct2/core/String.cpp
@@ -447,6 +447,12 @@ namespace String
         return utf8_write_codepoint(dst, codepoint);
     }
 
+    bool IsWhiteSpace(codepoint_t codepoint)
+    {
+        // 0x3000 is the 'ideographic space', a 'fullwidth' character used in CJK languages.
+        return iswspace((wchar_t)codepoint) || codepoint == 0x3000;
+    }
+
     utf8 * Trim(utf8 * str)
     {
         utf8 * firstNonWhitespace = nullptr;
@@ -456,7 +462,7 @@ namespace String
         utf8 * nextCh;
         while ((codepoint = GetNextCodepoint(ch, &nextCh)) != '\0')
         {
-            if (codepoint <= WCHAR_MAX && !iswspace((wchar_t)codepoint))
+            if (codepoint <= WCHAR_MAX && !IsWhiteSpace(codepoint))
             {
                 if (firstNonWhitespace == nullptr)
                 {
@@ -496,7 +502,7 @@ namespace String
         const utf8 * nextCh;
         while ((codepoint = GetNextCodepoint(ch, &nextCh)) != '\0')
         {
-            if (codepoint <= WCHAR_MAX && !iswspace((wchar_t)codepoint))
+            if (codepoint <= WCHAR_MAX && !IsWhiteSpace(codepoint))
             {
                 return ch;
             }
@@ -519,7 +525,7 @@ namespace String
         const utf8 * endSubstr = nullptr;
         while ((codepoint = GetNextCodepoint(ch, &nextCh)) != '\0')
         {
-            bool isWhiteSpace = codepoint <= WCHAR_MAX && iswspace((wchar_t)codepoint);
+            bool isWhiteSpace = codepoint <= WCHAR_MAX && IsWhiteSpace(codepoint);
             if (!isWhiteSpace)
             {
                 if (startSubstr == nullptr)
diff --git a/src/openrct2/core/String.hpp b/src/openrct2/core/String.hpp
index 895e419ce6..48e96066cb 100644
--- a/src/openrct2/core/String.hpp
+++ b/src/openrct2/core/String.hpp
@@ -94,6 +94,7 @@ namespace String
     codepoint_t GetNextCodepoint(const utf8 * ptr, const utf8 * * nextPtr = nullptr);
     utf8 *      WriteCodepoint(utf8 * dst, codepoint_t codepoint);
 
+    bool            IsWhiteSpace(codepoint_t codepoint);
     utf8 *          Trim(utf8 * str);
     const utf8 *    TrimStart(const utf8 * str);
     utf8 *          TrimStart(utf8 * buffer, size_t bufferSize, const utf8 * src);
diff --git a/test/tests/StringTest.cpp b/test/tests/StringTest.cpp
index 5b481c5535..fc8a147340 100644
--- a/test/tests/StringTest.cpp
+++ b/test/tests/StringTest.cpp
@@ -18,6 +18,8 @@ INSTANTIATE_TEST_CASE_P(TrimData, StringTest, testing::Values(
     TCase("      ", ""),
     TCase(" ストリング", "ストリング"),
     TCase("ストリング ", "ストリング"),
+    TCase("　ストリング　", "ストリング"),
+    TCase("　　　　", ""),
     TCase("", ""),
     TCase("\n", ""),
     TCase("\n\n\n\r\n", ""),