diff --git a/CMakeLists.txt b/CMakeLists.txt
index 194a92a36..87d0bb832 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,6 @@ if(PA_WARNINGS_ARE_ERRORS)
             # "Grandfathered" warnings that existed before we started enforcement.
             # Do *NOT* add warnings to this list. Instead, fix your code so that it doesn't produce the warning.
             # TODO: fix the offending code so that we don't have to exclude specific warnings anymore.
-            /wd4018 # W3 signed/unsigned mismatch
             /wd4244 # W2 conversion possible loss of data
             /wd4267 # W3 conversion possible loss of data
             /wd4996 # W3 unsafe/deprecated
diff --git a/qa/loopback/src/paqa.c b/qa/loopback/src/paqa.c
index 0427d83c1..909916b13 100644
--- a/qa/loopback/src/paqa.c
+++ b/qa/loopback/src/paqa.c
@@ -120,8 +120,8 @@ typedef struct LoopbackContext_s
     volatile int       minInputOutputDelta;
     volatile int       maxInputOutputDelta;
 
-    int                minFramesPerBuffer;
-    int                maxFramesPerBuffer;
+    unsigned long      minFramesPerBuffer;
+    unsigned long      maxFramesPerBuffer;
     int                primingCount;
     TestParameters    *test;
     volatile int       done;
@@ -849,7 +849,7 @@ static int PaQa_SingleLoopBackTest( UserOptions *userOptions, TestParameters *te
         {
             double latencyMSec;
 
-            printf( "%4d-%4d | ",
+            printf( "%4lu-%4lu | ",
                    loopbackContext.minFramesPerBuffer,
                    loopbackContext.maxFramesPerBuffer
                    );
diff --git a/qa/paqa_devs.c b/qa/paqa_devs.c
index c90ff8c70..1a70e842d 100644
--- a/qa/paqa_devs.c
+++ b/qa/paqa_devs.c
@@ -225,7 +225,7 @@ static int QaCallback( const void *inputData,
                        void *userData )
 {
     unsigned long frameIndex;
-    unsigned long channelIndex;
+    int channelIndex;
     float sample;
     PaQaData *data = (PaQaData *) userData;
     const PaQaTestParameters *parameters = data->parameters;
diff --git a/qa/paqa_latency.c b/qa/paqa_latency.c
index a70807b51..9f468bf53 100644
--- a/qa/paqa_latency.c
+++ b/qa/paqa_latency.c
@@ -61,8 +61,8 @@ typedef struct
     int left_phase;
     int right_phase;
     char message[20];
-    int minFramesPerBuffer;
-    int maxFramesPerBuffer;
+    unsigned long minFramesPerBuffer;
+    unsigned long maxFramesPerBuffer;
     int callbackCount;
     PaTime minDeltaDacTime;
     PaTime maxDeltaDacTime;
@@ -170,8 +170,8 @@ PaError paqaCheckLatency( PaStreamParameters *outputParamsPtr,
     printf("Play for %d seconds.\n", NUM_SECONDS );
     Pa_Sleep( NUM_SECONDS * 1000 );
 
-    printf("  minFramesPerBuffer = %4d\n", dataPtr->minFramesPerBuffer );
-    printf("  maxFramesPerBuffer = %4d\n", dataPtr->maxFramesPerBuffer );
+    printf("  minFramesPerBuffer = %4lu\n", dataPtr->minFramesPerBuffer );
+    printf("  maxFramesPerBuffer = %4lu\n", dataPtr->maxFramesPerBuffer );
     printf("  minDeltaDacTime = %f\n", dataPtr->minDeltaDacTime );
     printf("  maxDeltaDacTime = %f\n", dataPtr->maxDeltaDacTime );
 
diff --git a/src/hostapi/jack/pa_jack.c b/src/hostapi/jack/pa_jack.c
index 746885fb6..5c20b4420 100644
--- a/src/hostapi/jack/pa_jack.c
+++ b/src/hostapi/jack/pa_jack.c
@@ -507,7 +507,7 @@ static PaError BuildDeviceList( PaJackHostApiRepresentation *jackApi )
     // Add 1 for null terminator.
     size_t device_name_regex_escaped_size = jack_client_name_size() * 2 + 1;
     size_t port_regex_size = device_name_regex_escaped_size + strlen(port_regex_suffix);
-    int port_index, client_index, i;
+    unsigned long port_index, client_index, i;
     double globalSampleRate;
     regex_t port_regex;
     unsigned long numClients = 0, numPorts = 0;
diff --git a/test/patest_latency.c b/test/patest_latency.c
index 7f622c131..d0e4f3e02 100644
--- a/test/patest_latency.c
+++ b/test/patest_latency.c
@@ -93,7 +93,7 @@ static int patestCallback( const void *inputBuffer, void *outputBuffer,
 {
     paTestData *data = (paTestData*)userData;
     float *out = (float*)outputBuffer;
-    int i;
+    unsigned long i;
 
     (void) inputBuffer; /* Prevent unused variable warning. */