diff --git a/libs/codec/g726/libg726.vcproj b/libs/codec/g726/libg726.vcproj
index c0b23b3c1e..595e87f401 100644
--- a/libs/codec/g726/libg726.vcproj
+++ b/libs/codec/g726/libg726.vcproj
@@ -46,6 +46,7 @@
 				RuntimeLibrary="3"
 				UsePrecompiledHeader="0"
 				WarningLevel="4"
+				WarnAsError="true"
 				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="3"
 			/>
@@ -106,6 +107,7 @@
 				RuntimeLibrary="2"
 				UsePrecompiledHeader="0"
 				WarningLevel="4"
+				WarnAsError="true"
 				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="3"
 			/>