diff --git a/ppd/ppd.c b/ppd/ppd.c
index 35a5bf9d..181ebc59 100644
--- a/ppd/ppd.c
+++ b/ppd/ppd.c
@@ -844,6 +844,7 @@ ppdOpenWithLocalization(
       // Say all PPD files are UTF-8, since we convert to UTF-8...
       //
 
+      free(ppd->lang_encoding);
       ppd->lang_encoding = strdup("UTF-8");
       encoding           = ppdGetEncoding(string);
     }
@@ -859,6 +860,7 @@ ppdOpenWithLocalization(
       ppd->pcfilename = string;
     else if (!strcmp(keyword, "NickName"))
     {
+      free(ppd->nickname);
       if (encoding != CUPS_ENCODING_UTF_8)
       {
         cups_utf8_t	utf8[256];	// UTF-8 version of NickName
@@ -878,22 +880,26 @@ ppdOpenWithLocalization(
       ppd->ttrasterizer = string;
     else if (!strcmp(keyword, "JCLBegin"))
     {
+      free(ppd->jcl_begin);
       ppd->jcl_begin = strdup(string);
       ppdDecode(ppd->jcl_begin);	// Decode quoted string
     }
     else if (!strcmp(keyword, "JCLEnd"))
     {
+      free(ppd->jcl_end);
       ppd->jcl_end = strdup(string);
       ppdDecode(ppd->jcl_end);		// Decode quoted string
     }
     else if (!strcmp(keyword, "JCLToPSInterpreter"))
     {
+      free(ppd->jcl_ps);
       ppd->jcl_ps = strdup(string);
       ppdDecode(ppd->jcl_ps);		// Decode quoted string
     }
 #if HAVE_CUPS_3_X
     else if (!strcmp(keyword, "JCLToPDFInterpreter"))
     {
+      free(ppd->jcl_pdf);
       ppd->jcl_pdf = strdup(string);
       ppdDecode(ppd->jcl_pdf);		// Decode quoted string
     }
diff --git a/ppd/test_ppd_emit.c b/ppd/test_ppd_emit.c
index cde32426..87e2dc3a 100644
--- a/ppd/test_ppd_emit.c
+++ b/ppd/test_ppd_emit.c
@@ -1013,6 +1013,47 @@ main(void)
                  marked ? marked->choice : "(none)");
 
 
+  // T47 — Duplicate *JCLBegin / *JCLEnd / *JCLToPSInterpreter / *NickName /
+  //       *LanguageEncoding keywords in a PPD must not leak prior strdup()
+  //       allocations (OpenPrinting/fuzzing#46).
+  testBegin("ppdOpen with duplicate JCLBegin/JCLEnd/JCLToPSInterpreter does not leak");
+  {
+    static const char dup_jcl_ppd_text[] =
+      "*PPD-Adobe: \"4.3\"\n"
+      "*FormatVersion: \"4.3\"\n"
+      "*FileVersion: \"1.0\"\n"
+      "*LanguageVersion: English\n"
+      "*LanguageEncoding: ISOLatin1\n"
+      "*LanguageEncoding: ISOLatin1\n"
+      "*PCFileName: \"DUPJCL.PPD\"\n"
+      "*Manufacturer: \"Test\"\n"
+      "*Product: \"(Test Printer)\"\n"
+      "*ModelName: \"Test Duplicate JCL\"\n"
+      "*ShortNickName: \"TestDup\"\n"
+      "*NickName: \"First NickName\"\n"
+      "*NickName: \"Second NickName\"\n"
+      "*PSVersion: \"(3010.000) 0\"\n"
+      "*JCLBegin: \"first_begin<0A>\"\n"
+      "*JCLBegin: \"second_begin<0A>\"\n"
+      "*JCLToPSInterpreter: \"first_ps<0A>\"\n"
+      "*JCLToPSInterpreter: \"second_ps<0A>\"\n"
+      "*JCLEnd: \"first_end<0A>\"\n"
+      "*JCLEnd: \"second_end<0A>\"\n"
+      "*OpenUI *PageSize: PickOne\n"
+      "*DefaultPageSize: Letter\n"
+      "*PageSize Letter: \"\"\n"
+      "*CloseUI: *PageSize\n";
+    ppd_file_t *ppd_dup = open_embedded_ppd(dup_jcl_ppd_text);
+    bool ok = ppd_dup != NULL &&
+              ppd_dup->jcl_begin && !strcmp(ppd_dup->jcl_begin, "second_begin\n") &&
+              ppd_dup->jcl_ps && !strcmp(ppd_dup->jcl_ps, "second_ps\n") &&
+              ppd_dup->jcl_end && !strcmp(ppd_dup->jcl_end, "second_end\n") &&
+              ppd_dup->nickname && !strcmp(ppd_dup->nickname, "Second NickName");
+    testEnd(ok);
+    ppdClose(ppd_dup);
+  }
+
+
   // -------------------------------------------------------------------------
   // Tear down and return success/failure based on the framework flag.
   // -------------------------------------------------------------------------