diff --git a/src/libs/libg729/g729_lpc_729.cpp b/src/libs/libg729/g729_lpc_729.cpp
index 1b46598b..6d9e20e3 100644
--- a/src/libs/libg729/g729_lpc_729.cpp
+++ b/src/libs/libg729/g729_lpc_729.cpp
@@ -98,7 +98,7 @@ Lag_window (Word16 m,		/* (i)     : LPC order                        */
   Word32 x;
 
   for (i = 1; i <= m; i++) {
-    x = Mpy_32 (r_h[i], r_l[i], lag_h[i - 1], lag_l[i - 1]);
+    x = Mpy_32 (r_h[i], r_l[i], g729_lag_h[i - 1], g729_lag_l[i - 1]);
     L_Extract (x, &r_h[i], &r_l[i]);
   }
   return;
@@ -415,7 +415,7 @@ Az_lsp (Word16 a[],		/* (i) Q12 : predictor coefficients              */
 
   coef = f1;
 
-  xlow = grid[0];
+  xlow = g729_grid[0];
   ylow = (*pChebps) (xlow, coef, NC);
 
   j = 0;
@@ -423,7 +423,7 @@ Az_lsp (Word16 a[],		/* (i) Q12 : predictor coefficients              */
     j = add (j, 1);
     xhigh = xlow;
     yhigh = ylow;
-    xlow = grid[j];
+    xlow = g729_grid[j];
     ylow = (*pChebps) (xlow, coef, NC);
 
     L_temp = L_mult (ylow, yhigh);
diff --git a/src/libs/libg729/g729_lpcfunc.cpp b/src/libs/libg729/g729_lpcfunc.cpp
index e5f72bc6..3fa5b339 100644
--- a/src/libs/libg729/g729_lpcfunc.cpp
+++ b/src/libs/libg729/g729_lpcfunc.cpp
@@ -154,7 +154,7 @@ Lsp_lsf (Word16 lsp[],		/* (i) Q15 : lsp[m] (range: -1<=val<1)                */
 
     /* acos(lsp[i])= ind*256 + ( ( lsp[i]-table[ind] ) * slope[ind] )/4096 */
 
-    L_tmp = L_mult (sub (lsp[i], table[ind]), slope[ind]);
+    L_tmp = L_mult (sub (lsp[i], table[ind]), g729_slope[ind]);
     tmp = wround (L_shl (L_tmp, 3));	/*(lsp[i]-table[ind])*slope[ind])>>12 */
     lsf[i] = add (tmp, shl (ind, 8));
   }
diff --git a/src/libs/libg729/g729_tab_ld8a.cpp b/src/libs/libg729/g729_tab_ld8a.cpp
index 19352e93..0ec7cc71 100644
--- a/src/libs/libg729/g729_tab_ld8a.cpp
+++ b/src/libs/libg729/g729_tab_ld8a.cpp
@@ -65,7 +65,7 @@ Word16 hamwindow[L_WINDOW] = {
  | lag_wind[10]=  0.89481968                           |
  -----------------------------------------------------*/
 
-Word16 lag_h[M10] = {
+Word16 g729_lag_h[M10] = {
   32728,
   32619,
   32438,
@@ -78,7 +78,7 @@ Word16 lag_h[M10] = {
   29321
 };
 
-Word16 lag_l[M10] = {
+Word16 g729_lag_l[M10] = {
   11904,
   17280,
   30720,
@@ -98,7 +98,7 @@ Word16 lag_l[M10] = {
 
 /* table of cos(x) in Q15 */
 
-Word16 table[65] = {
+Word16 g729_table[65] = {
   32767, 32729, 32610, 32413, 32138, 31786, 31357, 30853,
   30274, 29622, 28899, 28106, 27246, 26320, 25330, 24279,
   23170, 22006, 20788, 19520, 18205, 16846, 15447, 14010,
@@ -112,7 +112,7 @@ Word16 table[65] = {
 
 /* slope in Q12 used to compute y = acos(x) */
 
-Word16 slope[64] = {
+Word16 g729_slope[64] = {
   -26887, -8812, -5323, -3813, -2979, -2444, -2081, -1811,
   -1608, -1450, -1322, -1219, -1132, -1059, -998, -946,
   -901, -861, -827, -797, -772, -750, -730, -713,
@@ -538,7 +538,7 @@ Word16 fg_sum_inv[2][M10] = {	/* Q12 */
  *-------------------------------------------------------------*/
 
 /* Version 51 points */
-Word16 grid[GRID_POINTS + 1] = {
+Word16 g729_grid[GRID_POINTS + 1] = {
   32760, 32703, 32509, 32187, 31738, 31164,
   30466, 29649, 28714, 27666, 26509, 25248,
   23886, 22431, 20887, 19260, 17557, 15786,
diff --git a/src/libs/libg729/g729_tab_ld8a.h b/src/libs/libg729/g729_tab_ld8a.h
index 295c1cef..f4519dfe 100644
--- a/src/libs/libg729/g729_tab_ld8a.h
+++ b/src/libs/libg729/g729_tab_ld8a.h
@@ -8,10 +8,10 @@
 */
 
 extern Word16 hamwindow[L_WINDOW];
-extern Word16 lag_h[M10];
-extern Word16 lag_l[M10];
+extern Word16 g729_lag_h[M10];
+extern Word16 g729_lag_l[M10];
 extern Word16 table[65];
-extern Word16 slope[64];
+extern Word16 g729_slope[64];
 extern Word16 table2[64];
 extern Word16 slope_cos[64];
 extern Word16 slope_acos[64];
@@ -20,7 +20,7 @@ extern Word16 lspcb2[NC1][M10];
 extern Word16 fg[2][MA_NP][M10];
 extern Word16 fg_sum[2][M10];
 extern Word16 fg_sum_inv[2][M10];
-extern Word16 grid[GRID_POINTS + 1];
+extern Word16 g729_grid[GRID_POINTS + 1];
 extern Word16 inter_3l[FIR_SIZE_SYN];
 extern Word16 g729_pred[4];
 extern Word16 gbk1[NCODE1][2];