diff --git a/wpilibc/src/main/native/cpp/PneumaticHub.cpp b/wpilibc/src/main/native/cpp/PneumaticHub.cpp
index f8c798489e..34b1d81f3c 100644
--- a/wpilibc/src/main/native/cpp/PneumaticHub.cpp
+++ b/wpilibc/src/main/native/cpp/PneumaticHub.cpp
@@ -161,11 +161,14 @@ void PneumaticHub::EnableCompressorAnalog(
                         "maxPressure must be between 0 and 120 PSI, got {}",
                         maxPressure);
   }
+
+  // Send the voltage as it would be if the 5V rail was at exactly 5V.
+  // The firmware will compensate for the real 5V rail voltage, which
+  // can fluctuate somewhat over time.
+  units::volt_t minAnalogVoltage = PSIToVolts(minPressure, 5_V);
+  units::volt_t maxAnalogVoltage = PSIToVolts(maxPressure, 5_V);
+
   int32_t status = 0;
-  units::volt_t minAnalogVoltage =
-      PSIToVolts(minPressure, Get5VRegulatedVoltage());
-  units::volt_t maxAnalogVoltage =
-      PSIToVolts(maxPressure, Get5VRegulatedVoltage());
   HAL_SetREVPHClosedLoopControlAnalog(m_handle, minAnalogVoltage.value(),
                                       maxAnalogVoltage.value(), &status);
   FRC_ReportError(status, "Module {}", m_module);
@@ -188,11 +191,14 @@ void PneumaticHub::EnableCompressorHybrid(
                         "maxPressure must be between 0 and 120 PSI, got {}",
                         maxPressure);
   }
+
+  // Send the voltage as it would be if the 5V rail was at exactly 5V.
+  // The firmware will compensate for the real 5V rail voltage, which
+  // can fluctuate somewhat over time.
+  units::volt_t minAnalogVoltage = PSIToVolts(minPressure, 5_V);
+  units::volt_t maxAnalogVoltage = PSIToVolts(maxPressure, 5_V);
+
   int32_t status = 0;
-  units::volt_t minAnalogVoltage =
-      PSIToVolts(minPressure, Get5VRegulatedVoltage());
-  units::volt_t maxAnalogVoltage =
-      PSIToVolts(maxPressure, Get5VRegulatedVoltage());
   HAL_SetREVPHClosedLoopControlHybrid(m_handle, minAnalogVoltage.value(),
                                       maxAnalogVoltage.value(), &status);
   FRC_ReportError(status, "Module {}", m_module);
diff --git a/wpilibj/src/main/java/edu/wpi/first/wpilibj/PneumaticHub.java b/wpilibj/src/main/java/edu/wpi/first/wpilibj/PneumaticHub.java
index 72b3b1b000..b7df47f0f3 100644
--- a/wpilibj/src/main/java/edu/wpi/first/wpilibj/PneumaticHub.java
+++ b/wpilibj/src/main/java/edu/wpi/first/wpilibj/PneumaticHub.java
@@ -294,8 +294,12 @@ public class PneumaticHub implements PneumaticsBase {
       throw new IllegalArgumentException(
           "maxPressure must be between 0 and 120 PSI, got " + maxPressure);
     }
-    double minAnalogVoltage = psiToVolts(minPressure, get5VRegulatedVoltage());
-    double maxAnalogVoltage = psiToVolts(maxPressure, get5VRegulatedVoltage());
+
+    // Send the voltage as it would be if the 5V rail was at exactly 5V.
+    // The firmware will compensate for the real 5V rail voltage, which
+    // can fluctuate somewhat over time.
+    double minAnalogVoltage = psiToVolts(minPressure, 5);
+    double maxAnalogVoltage = psiToVolts(maxPressure, 5);
     REVPHJNI.setClosedLoopControlAnalog(m_handle, minAnalogVoltage, maxAnalogVoltage);
   }
 
@@ -339,8 +343,12 @@ public class PneumaticHub implements PneumaticsBase {
       throw new IllegalArgumentException(
           "maxPressure must be between 0 and 120 PSI, got " + maxPressure);
     }
-    double minAnalogVoltage = psiToVolts(minPressure, get5VRegulatedVoltage());
-    double maxAnalogVoltage = psiToVolts(maxPressure, get5VRegulatedVoltage());
+
+    // Send the voltage as it would be if the 5V rail was at exactly 5V.
+    // The firmware will compensate for the real 5V rail voltage, which
+    // can fluctuate somewhat over time.
+    double minAnalogVoltage = psiToVolts(minPressure, 5);
+    double maxAnalogVoltage = psiToVolts(maxPressure, 5);
     REVPHJNI.setClosedLoopControlHybrid(m_handle, minAnalogVoltage, maxAnalogVoltage);
   }