diff --git a/libs/voipcodecs/src/lpc10_decode.c b/libs/voipcodecs/src/lpc10_decode.c
index c8142d9550..b4a60f1c07 100644
--- a/libs/voipcodecs/src/lpc10_decode.c
+++ b/libs/voipcodecs/src/lpc10_decode.c
@@ -43,10 +43,10 @@
 #if defined(HAVE_MATH_H)
 #include <math.h>
 #endif
-#if (_MSC_VER = 1400) /* fix for broken header files with msvc 2005*/
-#if !defined (_M_IA64) && !defined (_M_AMD64)
-#undef logf
-#define logf(x)     ((float)log((double)(x)))
+#if (_MSC_VER == 1400) /* fix for broken header files with msvc 2005*/
+#if !defined (_M_IA64) && !defined (_M_AMD64)
+#undef logf
+#define logf(x)     ((float)log((double)(x)))
 #endif    // !defined (_M_IA64) && !defined (_M_AMD64)
 #endif