diff --git a/glslang/Include/revision.h b/glslang/Include/revision.h
index a7ec5471..bacfd0ab 100644
--- a/glslang/Include/revision.h
+++ b/glslang/Include/revision.h
@@ -2,5 +2,5 @@
 // For the version, it uses the latest git tag followed by the number of commits.
 // For the date, it uses the current date (when then script is run).
 
-#define GLSLANG_REVISION "Overload400-PrecQual.1766"
+#define GLSLANG_REVISION "Overload400-PrecQual.1769"
 #define GLSLANG_DATE "13-Jan-2017"
diff --git a/glslang/MachineIndependent/Scan.cpp b/glslang/MachineIndependent/Scan.cpp
index d2f72844..0e64364e 100644
--- a/glslang/MachineIndependent/Scan.cpp
+++ b/glslang/MachineIndependent/Scan.cpp
@@ -721,7 +721,7 @@ int TScanContext::tokenize(TPpContext* pp, TParserToken& token)
 
         default:
             char buf[2];
-            buf[0] = token;
+            buf[0] = (char)token;
             buf[1] = 0;
             parseContext.error(loc, "unexpected token", buf, "");
             break;
diff --git a/glslang/MachineIndependent/preprocessor/Pp.cpp b/glslang/MachineIndependent/preprocessor/Pp.cpp
index 49c78ef8..abce3b56 100644
--- a/glslang/MachineIndependent/preprocessor/Pp.cpp
+++ b/glslang/MachineIndependent/preprocessor/Pp.cpp
@@ -968,7 +968,7 @@ int TPpContext::scanHeaderName(TPpToken* ppToken, char delimit)
 
         // found a character to expand the name with
         if (len < MaxTokenLength)
-            ppToken->name[len++] = ch;
+            ppToken->name[len++] = (char)ch;
         else
             tooLong = true;
     } while (true);
diff --git a/glslang/Public/ShaderLang.h b/glslang/Public/ShaderLang.h
index 60e539b4..6c3fb11c 100644
--- a/glslang/Public/ShaderLang.h
+++ b/glslang/Public/ShaderLang.h
@@ -374,16 +374,16 @@ public:
         // the C++ specification.
 
         // For the "system" or <>-style includes; search the "system" paths.
-        virtual IncludeResult* includeSystem(const char* headerName,
-                                             const char* includerName,
-                                             size_t inclusionDepth) { return nullptr; }
+        virtual IncludeResult* includeSystem(const char* /*headerName*/,
+                                             const char* /*includerName*/,
+                                             size_t /*inclusionDepth*/) { return nullptr; }
 
         // For the "local"-only aspect of a "" include. Should not search in the
         // "system" paths, because on returning a failure, the parser will
         // call includeSystem() to look in the "system" locations.
-        virtual IncludeResult* includeLocal(const char* headerName,
-                                            const char* includerName,
-                                            size_t inclusionDepth) { return nullptr; }
+        virtual IncludeResult* includeLocal(const char* /*headerName*/,
+                                            const char* /*includerName*/,
+                                            size_t /*inclusionDepth*/) { return nullptr; }
 
         // Signals that the parser will no longer use the contents of the
         // specified IncludeResult.