diff --git a/src/escpos/printer/cups.py b/src/escpos/printer/cups.py
index f9634c2..bdd53c3 100644
--- a/src/escpos/printer/cups.py
+++ b/src/escpos/printer/cups.py
@@ -49,8 +49,8 @@ def dependency_pycups(func):
         """Throw a RuntimeError if pycups is not imported."""
         if not is_usable():
             raise RuntimeError(
-                "Printing with PyCups requires the pycups library to"
-                "be installed. Please refer to the documentation on"
+                "Printing with PyCups requires the pycups library to "
+                "be installed. Please refer to the documentation on "
                 "what to install and install the dependencies for pycups."
             )
         return func(*args, **kwargs)
diff --git a/src/escpos/printer/lp.py b/src/escpos/printer/lp.py
index ff22e05..fafab26 100644
--- a/src/escpos/printer/lp.py
+++ b/src/escpos/printer/lp.py
@@ -34,7 +34,7 @@ def dependency_linux_lp(func):
         """Throw a RuntimeError if not on a non-Windows system."""
         if not is_usable():
             raise RuntimeError(
-                "This printer driver depends on LP which is not"
+                "This printer driver depends on LP which is not "
                 "available on Windows systems."
             )
         return func(*args, **kwargs)
diff --git a/src/escpos/printer/serial.py b/src/escpos/printer/serial.py
index 28ada62..0f55c9a 100644
--- a/src/escpos/printer/serial.py
+++ b/src/escpos/printer/serial.py
@@ -43,8 +43,8 @@ def dependency_pyserial(func):
         """Throw a RuntimeError if pyserial not installed."""
         if not is_usable():
             raise RuntimeError(
-                "Printing with Serial requires the pyserial library to"
-                "be installed. Please refer to the documentation on"
+                "Printing with Serial requires the pyserial library to "
+                "be installed. Please refer to the documentation on "
                 "what to install and install the dependencies for pyserial."
             )
         return func(*args, **kwargs)
diff --git a/src/escpos/printer/usb.py b/src/escpos/printer/usb.py
index e5d2dbe..79700b4 100644
--- a/src/escpos/printer/usb.py
+++ b/src/escpos/printer/usb.py
@@ -42,8 +42,8 @@ def dependency_usb(func):
         """Throw a RuntimeError if usb not installed."""
         if not is_usable():
             raise RuntimeError(
-                "Printing with USB connection requires a usb library to"
-                "be installed. Please refer to the documentation on"
+                "Printing with USB connection requires a usb library to "
+                "be installed. Please refer to the documentation on "
                 "what to install and install the dependencies for USB."
             )
         return func(*args, **kwargs)
diff --git a/src/escpos/printer/win32raw.py b/src/escpos/printer/win32raw.py
index d084436..7204b45 100644
--- a/src/escpos/printer/win32raw.py
+++ b/src/escpos/printer/win32raw.py
@@ -45,8 +45,8 @@ def dependency_win32print(func):
         """Throw a RuntimeError if win32print not installed."""
         if not is_usable():
             raise RuntimeError(
-                "Printing with Win32Raw requires a win32print library to"
-                "be installed. Please refer to the documentation on"
+                "Printing with Win32Raw requires a win32print library to "
+                "be installed. Please refer to the documentation on "
                 "what to install and install the dependencies for win32print."
             )
         return func(*args, **kwargs)