diff --git a/lib_com/options.h b/lib_com/options.h
index c215b53875ac89eb100fefe51be0261ff84ee41b..6deb68b869adc7953f903352764a5af1e6325404 100755
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -242,6 +242,7 @@
 
 #define BINAURAL_AUDIO_CMDLINE
 #define FIX_570_TCX_LPC_WRITE                           /* FhG: fix issue 570: LPC bitstream writer in TCX */
+#define FIX_506                                         /* FhG: Compiler warnings */
 
 /* ################## End DEVELOPMENT switches ######################### */
 /* clang-format on */
diff --git a/lib_dec/LD_music_post_filter.c b/lib_dec/LD_music_post_filter.c
index 87984e873a15af6bc744f1e32f4b3af1e409a8ea..0b8bed426c3f836efea94835ecb4190c8402f6bd 100644
--- a/lib_dec/LD_music_post_filter.c
+++ b/lib_dec/LD_music_post_filter.c
@@ -387,7 +387,10 @@ static void spectrum_mod_dct(
     float slope;
     float inv_noise[MBANDS_GN_LD];
     float *pt_gbin, alpha, tmpN;
-    int16_t i, cnt;
+    int16_t i;
+#ifndef FIX_506
+    int16_t cnt;
+#endif
     float *pt;
     float tmp, shift;
     const float *pt2;
@@ -475,7 +478,9 @@ static void spectrum_mod_dct(
 
             tmpN = slope * inv_noise[i];
             tmp = 0.0f;
+#ifndef FIX_506
             cnt = 0;
+#endif
             while ( freq <= mfreq_loc_LD[i] )
             {
                 gain = 1.0f;
@@ -502,7 +507,9 @@ static void spectrum_mod_dct(
 
                 *pt_gbin = gain + alpha * *pt_gbin;
                 *pt++ *= *pt_gbin;
+#ifndef FIX_506
                 cnt++;
+#endif
                 freq += BIN_16kdct;
                 pt_gbin++;
             }
diff --git a/lib_dec/hq_lr_dec.c b/lib_dec/hq_lr_dec.c
index 774720844c56abf7a28ea7cd13c4c312153f9077..1fa8b168c481f674bdaace9cdb8584b919fb707b 100644
--- a/lib_dec/hq_lr_dec.c
+++ b/lib_dec/hq_lr_dec.c
@@ -1370,10 +1370,14 @@ static void spt_shorten_domain_set_dec(
 )
 {
     int16_t j, k;
+#ifndef FIX_506
     int16_t kpos;
+#endif
     int16_t spt_shorten_flag[SPT_SHORTEN_SBNUM];
 
+#ifndef FIX_506
     kpos = 0;
+#endif
     j = 0;
     for ( k = bands - SPT_SHORTEN_SBNUM; k < bands; k++ )
     {
@@ -1390,7 +1394,9 @@ static void spt_shorten_domain_set_dec(
             }
         }
 
+#ifndef FIX_506
         kpos++;
+#endif
         j++;
     }
 
diff --git a/lib_dec/ivas_svd_dec.c b/lib_dec/ivas_svd_dec.c
index 785a9067804c9b252fb08d1922d4354d675ab801..7c4a0cf4bb69df87c2dd5477823eb3f2bd119c30 100644
--- a/lib_dec/ivas_svd_dec.c
+++ b/lib_dec/ivas_svd_dec.c
@@ -96,22 +96,26 @@ void mat2svdMat(
 )
 {
     int16_t i, j;
+#ifndef FIX_506
     int16_t posCounter;
+#endif
 
     if ( transpose )
     {
+#ifndef FIX_506
         posCounter = 0;
-
+#endif
         for ( i = 0; i < mCols; i++ )
         {
             for ( j = 0; j < nRows; j++ )
             {
                 svdMat[i][j] = mat[j + nRows * i];
-
+#ifndef FIX_506
                 if ( mat[j + nRows * i] > 0.0f )
                 {
                     posCounter++;
                 }
+#endif
             }
 
             set_zero( &svdMat[i][mCols], MAX_OUTPUT_CHANNELS - nRows );
diff --git a/lib_dec/swb_bwe_dec_lr.c b/lib_dec/swb_bwe_dec_lr.c
index 4f29becf248e298f1aa223816d64366b30f82a88..222316151d395d6fed0bad0565ee6b2897f266a7 100644
--- a/lib_dec/swb_bwe_dec_lr.c
+++ b/lib_dec/swb_bwe_dec_lr.c
@@ -130,7 +130,10 @@ static void DecodeSWBSubbands(
     float ss_min = 1.0f, g, be_tonal[SWB_HAR_RAN1], xSynth_har[L_FRAME32k];
     GainItem pk_sf[(NB_SWB_SUBBANDS) *8];
     int16_t lagIndices_real[NB_SWB_SUBBANDS];
-    int16_t pul_res[NB_SWB_SUBBANDS], cnt, imin;
+#ifndef FIX_506
+    int16_t cnt;
+#endif
+    int16_t pul_res[NB_SWB_SUBBANDS], imin;
     int16_t har_freq_est1 = 0;
     int16_t har_freq_est2 = 0;
     int16_t flag_dis = 1;
@@ -202,14 +205,18 @@ static void DecodeSWBSubbands(
         {
             lagGains[k] *= 0.9f;
         }
+#ifndef FIX_506
         cnt = 0;
+#endif
         for ( k = 0; k < NB_SWB_SUBBANDS; k++ )
         {
             th_g[k] = 0.0f;
             if ( p2a_flags[BANDS - NB_SWB_SUBBANDS + k] == 0 )
             {
                 th_g[k] = lagGains[k] * ss_min;
+#ifndef FIX_506
                 cnt++;
+#endif
             }
         }
         /* Construct spectrum */
diff --git a/lib_enc/swb_bwe_enc_lr.c b/lib_enc/swb_bwe_enc_lr.c
index afa9e75ac792c6d74bc4b5e1b1ef7dcbdc0a91d6..dd5bf3b4ca65a06911b977547ec9a198b571a2a9 100644
--- a/lib_enc/swb_bwe_enc_lr.c
+++ b/lib_enc/swb_bwe_enc_lr.c
@@ -66,11 +66,15 @@ static int16_t GetSubbandCorrIndex2_har(
     int16_t bestIdx, i, j;
     float corr, energy, corr_sq;
     float lagCorr_sq, lagEnergy, eOld;
+#ifndef FIX_506
     int16_t absPos;
+#endif
     int16_t N1, N2;
 
 
+#ifndef FIX_506
     absPos = 0;
+#endif
     bestIdx = 0;
     lagCorr_sq = 0.0f;
     lagEnergy = 1e30f;
@@ -130,7 +134,9 @@ static int16_t GetSubbandCorrIndex2_har(
         }
 
         predBuf++;
+#ifndef FIX_506
         absPos++;
+#endif
     }
 
     if ( lagCorr_sq == 0.0f && *prev_frame_bstindx < 0 )
@@ -512,7 +518,10 @@ static void EncodeSWBSubbands(
     float sspectra_ni[L_FRAME32k], sspectra_diff[L_FRAME32k], be_tonal[SWB_HAR_RAN1], xSynth_har[L_FRAME32k];
     float ss_min = 1.0f, th_g[NB_SWB_SUBBANDS];
     GainItem pk_sf[(NB_SWB_SUBBANDS) *8];
-    int16_t pul_res[NB_SWB_SUBBANDS], cnt;
+#ifndef FIX_506
+    int16_t cnt;
+#endif
+    int16_t pul_res[NB_SWB_SUBBANDS];
     int16_t har_freq_est1 = 0, har_freq_est2 = 0;
     int16_t flag_dis = 1;
     int16_t pos_max_hfe2 = 0;
@@ -599,14 +608,18 @@ static void EncodeSWBSubbands(
             lagGains[k] *= 0.9f;
         }
 
+#ifndef FIX_506
         cnt = 0;
+#endif
         for ( k = 0; k < NB_SWB_SUBBANDS; k++ )
         {
             th_g[k] = 0.0f;
             if ( p2a_flags[BANDS - NB_SWB_SUBBANDS + k] == 0 )
             {
                 th_g[k] = lagGains[k] * ss_min;
+#ifndef FIX_506
                 cnt++;
+#endif
             }
         }