diff --git a/src/modules/audio_processing/aec/aec_core.c b/src/modules/audio_processing/aec/aec_core.c
index f43c9246ec..49c0d13f3a 100644
--- a/src/modules/audio_processing/aec/aec_core.c
+++ b/src/modules/audio_processing/aec/aec_core.c
@@ -686,8 +686,14 @@ static void ProcessBlock(aec_t* aec) {
         int16_t farend[PART_LEN];
         int16_t* farend_ptr = NULL;
         WebRtc_ReadBuffer(aec->far_time_buf, (void**) &farend_ptr, farend, 1);
-        fwrite(farend_ptr, sizeof(int16_t), PART_LEN, aec->farFile);
-        fwrite(nearend_ptr, sizeof(int16_t), PART_LEN, aec->nearFile);
+        if (fwrite(farend_ptr, sizeof(int16_t),
+                   PART_LEN, aec->farFile) != PART_LEN) {
+          return -1;
+        }
+        if (fwrite(nearend_ptr, sizeof(int16_t),
+                   PART_LEN, aec->nearFile) != PART_LEN) {
+          return -1;
+        }
     }
 #endif
 
@@ -844,8 +850,14 @@ static void ProcessBlock(aec_t* aec) {
                 WEBRTC_SPL_WORD16_MIN);
         }
 
-        fwrite(eInt16, sizeof(int16_t), PART_LEN, aec->outLinearFile);
-        fwrite(output, sizeof(int16_t), PART_LEN, aec->outFile);
+        if (fwrite(eInt16, sizeof(int16_t),
+                   PART_LEN, aec->outLinearFile) != PART_LEN) {
+          return -1;
+        }
+        if (fwrite(output, sizeof(int16_t),
+                   PART_LEN, aec->outFile) != PART_LEN) {
+          return -1;
+        }
     }
 #endif
 }
diff --git a/src/modules/audio_processing/aec/echo_cancellation.c b/src/modules/audio_processing/aec/echo_cancellation.c
index 91553250e1..bd9d2c5b99 100644
--- a/src/modules/audio_processing/aec/echo_cancellation.c
+++ b/src/modules/audio_processing/aec/echo_cancellation.c
@@ -404,7 +404,10 @@ WebRtc_Word32 WebRtcAec_Process(void *aecInst, const WebRtc_Word16 *nearend,
             }
 
 #ifdef WEBRTC_AEC_DEBUG_DUMP
-            fwrite(&aecpc->skew, sizeof(aecpc->skew), 1, aecpc->skewFile);
+            if (fwrite(&aecpc->skew, sizeof(aecpc->skew),
+                       1, aecpc->skewFile) != 1) {
+              return -1;
+            }
 #endif
         }
     }
@@ -537,8 +540,13 @@ WebRtc_Word32 WebRtcAec_Process(void *aecInst, const WebRtc_Word16 *nearend,
     {
         int16_t far_buf_size_ms = (int16_t) (aecpc->aec->system_delay /
             (sampMsNb * aecpc->aec->mult));
-        fwrite(&far_buf_size_ms, 2, 1, aecpc->bufFile);
-        fwrite(&(aecpc->knownDelay), sizeof(aecpc->knownDelay), 1, aecpc->delayFile);
+        if (fwrite(&far_buf_size_ms, 2, 1, aecpc->bufFile) != 1) {
+          return -1;
+        }
+        if (fwrite(&(aecpc->knownDelay), sizeof(aecpc->knownDelay),
+                   1, aecpc->delayFile) != 1) {
+          return -1;
+        }
     }
 #endif
 
diff --git a/src/modules/audio_processing/ns/nsx_core.c b/src/modules/audio_processing/ns/nsx_core.c
index 51bde0c7c1..b8fe4b9bb1 100644
--- a/src/modules/audio_processing/ns/nsx_core.c
+++ b/src/modules/audio_processing/ns/nsx_core.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -1887,7 +1887,10 @@ int WebRtcNsx_ProcessCore(NsxInst_t* inst, short* speechFrame, short* speechFram
   assert(inst->magnLen == inst->anaLen2 + 1);
 
 #ifdef NS_FILEDEBUG
-  fwrite(spframe, sizeof(short), inst->blockLen10ms, inst->infile);
+  if (fwrite(spframe, sizeof(short),
+             inst->blockLen10ms, inst->infile) != inst->blockLen10ms) {
+    return -1;
+  }
 #endif
 
   // Check that initialization has been done
@@ -2364,7 +2367,10 @@ int WebRtcNsx_ProcessCore(NsxInst_t* inst, short* speechFrame, short* speechFram
 
   WebRtcNsx_DataSynthesis(inst, outFrame);
 #ifdef NS_FILEDEBUG
-  fwrite(outframe, sizeof(short), inst->blockLen10ms, inst->outfile);
+  if (fwrite(outframe, sizeof(short),
+             inst->blockLen10ms, inst->outfile) != inst->blockLen10ms) {
+    return -1;
+  }
 #endif
 
   //for H band:
@@ -2440,5 +2446,3 @@ int WebRtcNsx_ProcessCore(NsxInst_t* inst, short* speechFrame, short* speechFram
 
   return 0;
 }
-
-