diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index ef8a982..954b9ad 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -30,11 +30,16 @@ jobs:
           - '5.10'
           - '5.8'
           - '5.6'
+
         build-zlib:
           - 0
           - 1
 
-    name: Perl ${{ matrix.perl }} BUILD_ZLIB:${{matrix.build-zlib}}
+        cc-opts:
+            - ""
+            - "-Wc++-compat"
+
+    name: Perl ${{ matrix.perl }} BUILD_ZLIB:${{matrix.build-zlib}} ${{matrix.cc-opts}}
     steps:
     - uses: actions/checkout@v4
     - name: Setup perl
@@ -49,5 +54,6 @@ jobs:
       run: perl Makefile.PL && make
       env:
         BUILD_ZLIB: ${{matrix.build-zlib}}
+        PERL_MM_OPT: CCFLAGS="-Werror ${{matrix.cc-opts}}"
     - name: Test
       run: make test
diff --git a/Zlib.xs b/Zlib.xs
index 22467ef..c9a07a7 100644
--- a/Zlib.xs
+++ b/Zlib.xs
@@ -656,7 +656,7 @@ voidpf my_zcalloc (voidpf opaque, unsigned items, unsigned size)
     PERL_UNUSED_VAR(opaque);
     /* TODO - put back to calloc */
     /* return safecalloc(items, size); */
-    return safemalloc(items* size);
+    return (voidpf)safemalloc(items* size);
 }
 
 
diff --git a/zlib-src/zconf.h b/zlib-src/zconf.h
index 46a305f..703b7ef 100644
--- a/zlib-src/zconf.h
+++ b/zlib-src/zconf.h
@@ -408,12 +408,12 @@ typedef uLong FAR uLongf;
 
 #ifdef STDC
    typedef void const *voidpc;
-   typedef void FAR   *voidpf;
+   typedef Bytef      *voidpf;
    typedef Bytef      *voidp;
 #else
    typedef Byte const *voidpc;
-   typedef Byte FAR   *voidpf;
-   typedef Byte       *voidp;
+   typedef Bytef      *voidpf;
+   typedef Bytef      *voidp;
 #endif
 
 #if !defined(Z_U4) && !defined(Z_SOLO) && defined(STDC)