diff --git a/src/userland/hlib/stdio.c b/src/userland/hlib/stdio.c
index 85c14dd..2035921 100644
--- a/src/userland/hlib/stdio.c
+++ b/src/userland/hlib/stdio.c
@@ -68,11 +68,15 @@
     (*write)++;
 }
 
-void putInt(char **write, uintptr_t x) {
+void putInt(char **write, intptr_t x) {
     if (x == 0) {
         addChar(write, '0');
         return;
     }
+    if (x < 0) {
+        addChar(write, '-');
+        x *= -1;
+    }
     for (intptr_t i = 10; i >= 0; i--) {
         uintptr_t n = x / power(10, i);
         if (n) {
@@ -81,7 +85,7 @@
     }
 }
 
-uint32_t getInsertLength(char insertType, uintptr_t x) {
+uint32_t getInsertLength(char insertType, intptr_t x) {
     switch (insertType) {
     case 's':
         return strlen((char *)x);
@@ -90,7 +94,7 @@
     case 'c':
         return 1;
     case 'i':
-        return intLength(x);
+        return intLength(x) + (x < 0);
     }
     return 0;
 }

diff --git a/src/userland/hlib/stdio.c b/src/userland/hlib/stdio.c
index 85c14dd..2035921 100644
--- a/src/userland/hlib/stdio.c
+++ b/src/userland/hlib/stdio.c
@@ -68,11 +68,15 @@
     (*write)++;
 }
 
-void putInt(char **write, uintptr_t x) {
+void putInt(char **write, intptr_t x) {
     if (x == 0) {
         addChar(write, '0');
         return;
     }
+    if (x < 0) {
+        addChar(write, '-');
+        x *= -1;
+    }
     for (intptr_t i = 10; i >= 0; i--) {
         uintptr_t n = x / power(10, i);
         if (n) {
@@ -81,7 +85,7 @@
     }
 }
 
-uint32_t getInsertLength(char insertType, uintptr_t x) {
+uint32_t getInsertLength(char insertType, intptr_t x) {
     switch (insertType) {
     case 's':
         return strlen((char *)x);
@@ -90,7 +94,7 @@
     case 'c':
         return 1;
     case 'i':
-        return intLength(x);
+        return intLength(x) + (x < 0);
     }
     return 0;
 }
diff --git a/src/userland/usb/xhci/xhci.c b/src/userland/usb/xhci/xhci.c
index 6cb456b..24abc7a 100644
--- a/src/userland/usb/xhci/xhci.c
+++ b/src/userland/usb/xhci/xhci.c
@@ -208,21 +208,10 @@
         slot->controller->doorbells[slot->slotIndex] = endpointIndex + 1;
         await(serviceId, eventId);
         MouseReport *report = buffer;
-        printf("event: buttons: %i, ", report->buttons);
-        // TODO add negative number printing support to printf
-        if (report->x < 0) {
-            printf("x: -%i, ", -report->x);
-        } else {
-            printf("x: %i, ", report->x);
-        }
-        if (report->y < 0) {
-            printf("y: -%i\n", -report->y);
-        } else {
-            printf("y: %i\n", report->y);
-        }
+        printf("event: buttons: %i, x: %i, y: %i\n", report->buttons, report->x, report->y);
         // todo: sleep for at least endpoint->interval?
         // todo: start this loop in a fork?
-        sleep(100);
+        sleep(10);
     }
 }